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. Details:Solid wood frames with inset colored acrylic windowsSet includes 20 assorted shapesDurable hardwood frames with vibrantly colored insetsOne third smaller than standard unit block measurementsMaterial: Hardwood frames with primary colored, transparent acrylic windowsEducational Focus: Hand-eye coordination, visual perception, color exploration or light table activitiesWinner of Oppenheim Toy Portfolio Gold AwardSuggested Age: 2+