Archimedes Hole Blocks 100pcs CoolThe unique "hole" shape makes the work more breathable and transparent, bringing a unique sensory experience, and unlocking the secret of "light and shadow" during play; Native bamboo and wood powder + recyclable PP + natural resin, selecting renewable materials from nature, easier to achieve standardized cutting, no deformation and no burr; The building blocks can be washed and placed in a cool and ventilated place to dry; Surface groove design, open