This set of wooden nuts and bolts features 7 shapes and colors (7 pairs in each shape and color). The muted, non-toxic paint on each shape allows for the natural Beech wood grain to show. Each nut has a matching bolt for pairing by color and shape. All the shapes have a different number of sides for early shape attribute identification. Twisting these shapes can improve finger dexterity and hand-eye coordination. The loose parts on these nuts and bolts allow children to arrange and explore on their own terms. For ages 12m+. Size of circle bolt: 2.6"L x 1.4" dia.