The plastic boxes are constructed of polypropylene, is an extremely flexible organizational system. Each divider can be moved 1/16 of an inch (0.16 cm) along a ribbed compartment, allowing for customization of individual compartments. The IDS also offers excellent chemical resistance. Size: 13-1/8″ x 8-7/8″ x 1-15/16″ . Includes x16 plastic divider tabs.