Guidecraft Rainbow Blocks Set - 30 Pcs. Kids Learning & Educational Toys, Stacking Blocks Solid wood frames with inset colored acrylic windows for ages 2+ Set includes 8 squares, 4 1/2 circles, 2 large triangles, 6 small triangles and 10 rectangles Standard unit block measurements Material: Hardwood frames with primary colored, transparent acrylic windows Educational Focus: Hand-eye coordination, visual perception, color exploration or light table activities