This 35-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. in progression to the other Imagination sets this 35-piece kit includes elongated Wedgits expansion parts that allow for unique designs that support structural linking and balanced construction. Includes Design Guide booklet and optional ParentTeacher Activity Guides. All Wedgits Imagination sets are 100 compatible.