Grimm's Large Mosaic Square Building Set of 100 Wooden Cube Blocks with 17-inch Storage Tray, 4x4 Size 100 wooden cubes (each measure 4 cm on all sides) in a beautiful array of 20 different colors! Open-ended toy; kids can create many color & shape designs, either in or out of the frame. Use for both imaginative/creative play and as a learning tool for making basic math concepts fun. Each block is cut and sanded by hand, removing sharp edges and corners. Handcrafted in Germany using sustainable hardwoods & certified child-safe, water based colors (no varnish or paint!)