Designed to be superior in every way. Polycarbonate vial holders withstand both cryogenic freezing and autoclaving. Orientation of samples is easy with embossed index numbers, squared upper left corner, and sloped sides. Molded-in tabs in the bottom of each well help secure vials in place for one-handed opening and closing. Ribbed grips make handling with gloves easier. Color blue. Hold cryogenic vials upt 2.0ml. Sold by the each