Made of polypropylene, chemically resistant to alcohols and mild organic solvents Can be repeatedly frozen and thawed 9x9 (81-Well) Compatible with 1.5ml or 2.0ml microtubes and cryogenic vials Boxes feature numbered grids for sample identification Drain holes and air vents minimize condensation Five assorted colors available Suitable for storage in mechanical freezers Temperature range: stable from -90℃ to 121℃