Made of durable cardboard with superior white outer coating Chemically resistant to alcohols and mild organic solvents Five assorted colors available: white, yellow, pink, blue, and green White Premium Cardboard Freezer Boxes has a matte coating Water-resistant coating for improved durability Holds 0.5ml, 1.5ml, 2.0ml, 5ml and 10ml microtubes Working temperature: stable from -196??C to 121??C Suitable for liquid nitrogen freezing