MasterPieces puzzle accessory Sort & Save. Use these stackable, interlocking, 1500-piece jigsaw puzzle sorting trays to help you organize and plan your puzzling adventure. The 6-piece sorting trays come in blue, yellow, and purple. They help you sort your puzzle pieces by size, shape, location, or color. They interlock to help you keep your trays together and stack to allow for easy storage of your unfinished puzzle. Masterpieces industry leading puzzle accessory sorting trays will help make your puzzling experience that much better.