This 15-piece building block product, called the Wedgits Imagination series, was designed for kids Ages 3 to 10 in. support of gross motor skill development . It is ideal for classrooms, day-care facilities or home-schooling environments. Wedgits building blocks are graduated in size. The five primary block shapes nest, stack and wedge together. Includes Design Guide booklet and optional, Parent/Teacher Activity Guides. All Wedgits Imagination sets are 100% compatible.