This tray is molded of heavy-gauge, high-density polyethylene for strength and rigidity. The unbreakable, lightweight tray is chemical-resistant and features a skid-resistant bottom. The 16 in. x 30 in. tray comes with a 10 in. x 23 in. Disecto Flex-Pad as a dissecting surface. (NO WAX - NO MESS.) The trays are easily stacked for storage.