An adventure in color and light! One-third smaller than unit block size, Junior 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:Assorted colorsVarious sized pieces40 piecesGreat for building, light and color explorationSolid Hardwood Frames with inset acrylic panels