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15pcs Arch & Tunnel Builder Kit - Birch plywood construction with graduated arch sizes for progressive building challenges
15pcs Arch & Tunnel Builder Kit - Complete set overview Graduated arch shapes showing four different sizes for progressive learning Birch plywood construction with environmental coating and smooth finish Bridge building and tunnel systems construction educational play

Item No: XTG071

15pcs Arch & Tunnel Builder Kit

This specialized 15-piece arch and tunnel set features four graduated sizes creating progressive building challenges. Birch plywood construction with environmental coating provides architectural elements perfect for bridge building, tunnel systems, and spatial concept exploration through curved structures.

Primary Materials: Birch plywood with environmental coating

Safety Features: Electrostatic spray eco-friendly water-based paint, smooth finish

Safety Standards: GB6675-2014 + GB18581-2020 comprehensive testing certified

Max Product Size: φ24×16×12cm

Wall Thickness: 1cm for optimal durability

Total Components: 15 pieces (4 graduated arch shapes)

Progressive System: Graduated sizes for building challenges

Construction: Birch plywood with environmental coating protection

Finish Quality: Electrostatic spray eco-friendly water-based paint

Surface Texture: Smooth finish for safe handling

Educational Value: Architectural elements design and spatial concepts

Applications: Bridge building, tunnel systems, curved structures

Durability: 1cm wall thickness for long-lasting educational play

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Frequently Asked Questions About 15pcs Arch & Tunnel Builder Kit

This arch and tunnel builder kit is designed for children aged 3+ years with adult supervision. Perfect for developing spatial concepts, architectural understanding, and engineering skills through progressive building challenges.

Made from birch plywood with environmental coating and electrostatic spray eco-friendly water-based paint. All materials meet GB6675-2014 + GB18581-2020 comprehensive testing standards for safe educational play.

The set includes 15 pieces featuring 4 graduated arch shapes with progressive sizing. Maximum product size is φ24×16×12cm with 1cm wall thickness for durability and stability.