MTC Bio's FlipTop™ hinged lid freezer boxes are made of recyclable cardboard with a liquid-resistant outer coating. Featuring 81 or 100 individual cardboard dividers, plus drain slots on the bottom surface and numbered grid markings on multiple sides, these boxes can be used at temperatures ranging from -196 degrees Celsius to +121 degrees Celsius. Available in white and 5 individual colors, plus a “Rainbow Pack” of 5 assorted colors.