Boxes withstand temperatures from -80°C to 121°C, and will not degrade after repeated thaws. Each box features an alphanumeric grid on the exterior and interior, stacking rings and a matte surface suitable for markers or labels. Available with clear or fluorescent colored lids with clear bottoms for easy visual identification. Boxes accommodate 0.5, 1.5, and 2.0 mL microtubes and most brands of cryogenic vials. Black box is suitable for light sensitive samples.