174 Piece Big Set Marble Run with a Storage Carrying Bag, Educational Construction Building Blocks, Creative STEM Toy for Kids 4 5 6 7 8+ Years Boys and Girls
- Each building block has a large diameter, and is designed with polygonal edges to make tight connections. This design helps prevent shaking and falling apart when children are building up the blocks.
- High Quality: All the building pieces are made of high quality non-toxic translucent ABS materials. This set has CE and EN71 certificates, very safe for children.
- Ideal Ratio: This set has the best ratio of action blocks to basic building blocks(1: 3), which maximizes the playability and possibility of combination. A great various configuration could be created based on such reasonable ratio.