Grimm's Mosaic Square of 36 Wooden Cube Blocks with Storage Tray, 4x4 Size 36 colorful wooden cubes (4 cm/1.6 in on all sides) in a sturdy wood building/storage frame. Open-ended toy; kids can create many color & shape designs, either in or out of the frame. Use for both imaginative/creative play or 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 Europe by toy artisans using sustainable hardwoods & water based colors (no varnish!).