... geometry shape, in & out are different shape for each, 4cm size, make up differ building. 1. circle,heart, square & triangle four different ... . made out off soft rubber material, which is recycle plastic, more safe for kids too, ASTM F963 & CE standard, Phthalate & Lead free ... make up many different building shape, a good kind of building block.6. a good kind of intelligence goys for kids as well as ...