Polypropylene boxes withstand freezing (to -80ºC) and autoclaving. The 3-point hinge maintains its integrity during repeated use. A positive catch keeps the lid securely fastened. Alpha-numeric indexing is printed inside the boxes for easy sample ID, and the clear lid allows visibility even when the lid is closed. Boxes are available in a variety of colors for coding samples and hold one hundred 1.5/2.0 mL tubes, cryovials or chromatography vials. Measure 42 x 142 x 55 mm. A solid black box is available for light sensitive samples.