Grimms Large Color Spiral"Large Color Spiral" Imaginative young builders can make two dimensional graphic patterns and images, three dimensional towers, houses, fences, ships and so much more with this set. By building and playing with the blocks, children develop fine motor skills and spatial thinking skills. 72 pieces in a wooden frame. Materials: lime wood, non toxic water based color stain non toxic plant based oil finish. Size: diameter 38cm, single blocks 4cm thickness.