Learning Resources Wooden Geometric Solids (Set of 12). This set of 12 smooth, solid hardwood geometric shapes range from 5cm to 8cm in size. Sturdy solid 3D wooden shapes can be used to teach a variety of numeracy skills including shapes, size and relationships. Teaching guide included. Suitable for ages 6+. Need more? Take a look at the Learning Resources Wooden Geometric Solids (Set of 19)