CELLTREAT 50mL Sterile Pipet. Individually Wrapped in Paper/Plastic in bags in a case of 100. Bi-directional (positive and negative) graduations are printed in bold easy-to-read black ink . Color coded stripes and packaging enable quick volume identification. All pipets contain premium material barrier plug. All pipets include printed indicator arrows for quickly locating negative graduations when using a pipet. All serological pipets are manufactured to the ASTM Standard Specification for Serological Pipets E-934. Manufactured from USP Class VI medical grade virgin polystyrene, RNase/DNase Free. Non-pyrogenic Packaged sterile (gamma irradiated) individually wrapped in paper/plastic wrappers.