The shaped wood is smooth and has a coating of some sort to keep them form splintering. He is able to make molded shapes out of his sand and use the shaping tool to help him get the shapes all even. He has had a lot of fun playing with these molds. This 6 Piece Set of Bamboo Wooden Geometric Sand Molds is amazing. You get 6 different shapes a Triangle, Circle, Hexagon, Rectangle, Inverted Square and Shaping Tool. This work great with my son sand alive. They are a prefect size for his little hands to hold and work with. This is good quality and fun to play with. I recommend these molds.