This made of smooth natural wood and Eco-friendly paint.Each block match with one hole, different shape of geometrics and colors great for baby to develop their observation ability and hand-eye coordination.It's a basic percussion platform set, and also the first blocks for baby, solid wood shapes are easy for little hands to grasp, great for developing early sorting skills.Wood percussion platform match the hole, fit the pieces in the matching holes, then dump them out and do it again.Recommended for kids above 3 years