The FisherbrandTM 50mL Centrifuge Tubes are made of polypropylene with a conical bottom and a screw cap closure. They have graduations up to 50mL and can withstand centrifugal forces up to 5,000 x g. These tubes are sterile, DNase/RNase free, non-pyrogenic and have low protein binding. They can be used for a variety of laboratory applications including sample preparation, storage, and centrifugation. With the proper cap, they can be used for cell culture applications. These tubes provide reliable performance across routine laboratory procedures.