At 128 large 10cm foam blocks across 8 Signature shapes, recommended for 7-10 children, it is the only BUILDER set that serves a double-digit group with full personal block access for every participant simultaneously. One hundred and twenty-eight blocks divided among ten children gives each approximately 12-13 blocks - enough to build a complete independent structure before combining, and enough for the group's combined floor build to fill a meaningful area of room floor at a scale that defines the space rather than simply occupying a corner of it.

The 7-10 child recommendation is a significant institutional threshold. In most early years and educational settings, group sizes of 7-10 correspond to a half-class rotation, a full OT programme cohort, a large-group STEAM construction period, or a programme session where two normal table groups have been combined for a joint activity. These are the sessions where a setting needs to know that every participant is fully provisioned from the start - not managing block allocation, not sequencing children through a shared pool, not ending the session with some children underserved because the block count was calibrated for a smaller group.

Each block is made from closed-cell EVA foam with a waterproof rotating neodymium magnet capsule. Every face of every block attracts every other face in any orientation. The blocks are EN71-certified, BPA-free, non-toxic, and disinfectable between sessions. The set includes a storage bag and is fully compatible with all other TUKI BIG BUILDER and SMART sets. 

Key Features of the TUKI BIG Magnetic Blocks Set - Builder 128

• 128 Large 10cm Magnetic Foam Blocks - Recommended for 7-10 Children - 128 blocks for 7-10 children gives each participant approximately 12-13 blocks, maintaining the self-organising construction threshold across the widest child group in the entire BUILDER range - the first set to serve a double-digit group with full personal block access
• 8 Signature TUKI Block Shapes - The full 8-shape vocabulary including cubes, beams in multiple variants, L-shapes, and triangles; the same complete shape set as all preceding large BUILDER sets, with the highest block count in the BUILDER range providing approximately 16 blocks per shape type across the set
• 10cm x 10cm x 10cm Large-Format BIG Blocks - Each block is a full 10cm cube, twice the linear dimension of the Regular range and eight times the volume per block; floor-scale, both-hands, whole-body building blocks that develop gross motor planning, bilateral coordination, and proprioceptive body awareness
• Rotating Neodymium Magnet Capsules - Full-Angle Connectivity - Every face of every block attracts every other face in any orientation; no wrong connections, no failed placements; reliable magnetic connectivity at the scale and frequency of 7-10 child group building where scores of connections are made simultaneously across a session
• Four Colours - Turquoise, Grey, Yellow and Pink - One hundred and twenty-eight blocks across four colours provides approximately 32 blocks per colour - enough for each child in a group of ten to work with a dedicated colour allocation simultaneously, enabling the most deliberate colour-based construction in the BUILDER range
• Closed-Cell EVA Foam - Waterproof, Disinfectable and Floating - Made from closed-cell EVA foam that does not absorb water; blocks wipe clean or disinfect in seconds between sessions; rated for daily high-frequency institutional use across multiple large groups throughout the day
• EN71-Certified, BPA-Free and Non-Toxic - Certified to EN71-1, EN71-2, and EN71-3 European toy safety standards; BPA-free and non-toxic; independently safety-tested; appropriate for all regulated early years, therapy, and institutional settings
• Storage Bag Included - The set includes a storage bag designed for institutional use; pack-away, transport between rooms, and hygiene management between large-group sessions
• Compatible with All TUKI BIG BUILDER and SMART Sets - Every block is fully compatible with all other TUKI BIG products; settings that own any other BUILDER or SMART set can combine it with the Builder 128 to extend the collection further
• Poland's Toy of the Year 2023 - Made in Poland - Awarded Poland's Toy of the Year 2023; manufactured in Poland to EN71 European standards

Why a 7-10 Child Group Changes the Construction Dynamic

The progression from Builder 110's 6-9 child recommendation to Builder 128's 7-10 child recommendation is a single step at the high end. But the shift from 9 children to 10 is the first time the BUILDER range crosses into double-digit group territory, and that matters to institutional buyers for a specific operational reason.

When a setting has a group of exactly 10 children - a common early years small-class size, a standard OT cohort limit, a typical STEAM rotation group - the Builder 110 at 9 children maximum leaves one child without a full personal block allocation. The Builder 128 serves all 10 without adjustment. For settings where 10 is the operating group size, this is not a marginal difference; it is the difference between a set that works for the group and one that requires management.

Skills and Developmental Outcomes

• Collaborative Construction and Social Communication Across a Full Large Group - Building with 7-10 children using a shared pool of 128 blocks generates the most complex sustained collaborative floor construction in the BUILDER range; the group size and block abundance together create conditions for both independent sub-building and voluntary collaborative pair work within the same session
• Gross Motor Planning, Bilateral Coordination and Core Strength - Lifting, carrying, and placing 10cm large-format foam blocks across an extended 7-10 child session develops bilateral coordination, motor planning, core stability, and whole-body spatial awareness at the highest group scale the BUILDER range provides
• Spatial Reasoning and 3D Engineering at Full BUILDER Complexity - Combining 8 Signature shapes across 128 blocks produces the most architecturally complex and spatially rich group floor constructions achievable in the BUILDER range; the robot and dog figure builds visible in the product imagery represent the construction complexity this count supports
• Executive Function, Distributed Leadership and Multi-Level Group Coordination - Managing a 7-10 child build at 128-block scale requires sub-group formation, distributed leadership, multi-level planning, and the most demanding executive function load of any BUILDER session; the double-digit group size introduces coordination requirements that smaller groups do not generate
• Voluntary Collaborative Pair Work Within Group Sessions - When personal block access is assured and block scarcity is removed, children voluntarily choose to build together rather than building separately; this voluntary collaborative pair dynamic - evidenced in the product imagery - produces a richer quality of joint problem-solving and shared creative decision-making than necessity-driven collaboration
• Proprioceptive and Tactile Sensory Processing Across the Full Cohort - Repeated lifting, carrying, and placing of 128 large-format EVA foam blocks across an extended large-group session provides sustained proprioceptive and tactile sensory engagement for every participant simultaneously

Ideal for

• Kindergartens and preschools running large-group or half-class construction activities for 7-10 children, including combined table-group STEAM construction periods
• Special education departments and inclusive classrooms running full-cohort group construction programmes where 8-10 children work simultaneously
• Occupational therapy programmes with cohort sizes of 7-10 children where large-format collaborative floor building is the therapeutic medium
• Sensory rooms sized for full large-group provision where the Builder 110's 9-child maximum is insufficient for the programme's group size
• Settings that operate with groups of exactly 10 children and need a BUILDER set that serves the full group without block allocation management
• High-traffic institutional playrooms - hotels, children's hospitals, rehabilitation centres, childcare centres - where 128 blocks provides the most generous single-set provision in the BUILDER range
• Settings that already own smaller BUILDER sets and want to scale to the full BUILDER ceiling
• Any institution that has evaluated the SMART sets and determined that a defined-group BUILDER model - rather than high-traffic open-ended rotation - is the right operational fit for their programme

• Single block: 10×10×10 cm
• Set/packaging: 70 x 70 x 50 cm
• Weight: 30kg
• Colours: Turquoise, Grey, Yellow, Pink (approx equal distribution, approximately 32 blocks per colour)
• Magnet type: Neodymium magnets in waterproof rotating capsules
• Material: Closed-cell EVA foam, BPA-free, non-toxic