Bio Plas 4202SL Siliconized Polypropylene Conical 1.5mL Screw Cap Microcentrifuge Tube, without Skirt, Autoclavable (Case of 1000) An extremely low surface adhesion, ideal for protein or nucleic acid studies to prevent any possible loss of sample due to adherence to the inner walls of he tube allowing complete sample recovery A positive Screw Cap seal with an "O"-Ring designed to provide a safe, reliable secure fit even for repeated cap closures Can withstand centrifugal forces up to 25,000 x G and are available in four configurations of tubes, both sterile and non-sterile A tight seal closure eliminates accidental opening during incubation, spinning or transporting