The MTC Bio R2781-O FlipTop Cardboard Freezer Box with Attached Hinged Lid, 81-Place, Orange, Pack of 5, is made of recyclable cardboard, with a liquid resistant outer coating. The set of boxes is shipped fully assembled with 81 place cardboard dividers. Each box has drain slots on the bottom surface and numbered grid markings in almost every conceivable location (top, bottom, sides, etc). The boxes feature a vibrant orange color.