This set of 24 panels features 4 shapes: semicircles, rectangles, squares and triangles. Each shape comes in 6 sizes, and all the panels are made from sustainably cultivated European Beech wood. They're designed for use with our Rainbow Wooden Architect Shapes (# 73418, 73416, 73414 and 73412) and provide a foundation for children to create their own structures and building methods. Introduce STEM concepts, spatial reasoning skills and more. The surface of these panels features a natural Beech wood grain. The edges are rounded and the wood won't splinter, making these panels safe to use for toddlers. For ages 12m+. Sizes: 2.5"L x 1.3"W x 0.3" H - 2.5"L x 1.3"W x 0.3" H (arches), 8.9"L x 6.1"W - 5.5"L x 2.5"W (rectangle), 6.1"W - 2.5"W (square), 12"L x 6"W - 3.7"L - 2.6"W (triangle).