CELLTREAT Sterile 50mL Pipet. Individually wrapped sterile in Paper/Plastic and packaged in bags in a case of 90. Color coded stripes and packaging enable quick volume identification, bi-directional graduations are printed in bold easy-to-read black ink. All pipets contain a premium material filter plug. Manufactured from medial grade virgin polystyrene. All serological pipets are manufactured to the ASTM Standard Specification for Serological Pipets E-934. All serological pipets are packaged sterile (gamma irradiated) individually wrapped in bags or dispenser cartons or bulk packed in bags.