An adventure in color and light! One-third smaller than unit block size, Jr. Rainbow Blocks are a new challenge in creating structures and extending traditional block play. Smooth hardwood frames with inset, colorful, transparent acrylic windows are also ideal for color exploration and light table activities .Solid wood frames with inset colored acrylic windows Set includes 40 assorted shapes Durable hardwood frames with vibrantly colored insets One third smaller than 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 Suggested Age: 2+