Made of extra strong polycarbonate, these durable cryogenic storage boxes are designed to be used at temperatures between -196ºC and +121ºC and are autoclavable at 120ºC, 15 psi (1 bar) for 20 minutes. A transparent cover allows the user to see the contents of the box, and is keyed to the base to prevent misalignment. Printed with a series of squares (numbered from 1 to 25), the surface accepts writing with markers, facilitating inventory control.