This 35-piece building block product called the Wedgits Imagination series was designed for kids Ages 7.6cm - 25cm . 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 Parent/Teacher Activity Guides. All Wedgits Imagination sets are 100% compatible.