These six wooden panels are designed for use with our Rainbow Wooden Architect Rectangles (# 73414, sold separately). Use them to provide a foundation for building and stacking. These smooth, rectangular panels are made from sustainable beechwood and allow kids to stack and create structures with multiple levels. Children will love creating their own unique formations and building methods. For ages 12+ months. Size of largest panel: 9" x 6.1" x 0.3" .