This Wooden Shape Twister features 7 shapes that screw on and off a giant wooden bolt. Each shape has a different number of sides so children can become familiar with shapes and their attributes. Each of the 7 shapes features a different color: red, orange, yellow, green, light blue, dark blue and purple. Twisting and screwing these shapes can improve finger dexterity and develop hand-eye coordination. The loose parts on this shape twister allow children to arrange and explore on their own terms, fostering problem solving and critical thinking skills. For ages 18m+. Size of bolt: 7.9"H. Size of square nut: 2"W.