These original Stack-Em Puzzle Sorting Trays allow the puzzler in your life to organize pieces by color, theme or border, and keep them categorized while working on assembly. When it is time to take a break, simply stack the trays on top of each other for neat space-saving storage. Set includes six colorful trays with one clear plastic top. Each tray measures 7-3/4" x 5-3/4". Complete stack measures 4-1/4" tall.