Tube, 14mL, 17 x 100mm PS, w/cap, 1/sterile peel, 500/cs These disposable sterile tubes are made of high quality polypropylene (PP) plastic that will withstand temperatures from -190 degrees to +120 degrees C. They are also available in crystal clear polystyrene (PS) with a range of 0 degrees to 70 degrees C. Caps are made of polyethylene (PE) and have the popular two position design (up/loose for aerobic work and down/sealed for anaerobic cultures). Polystyrene tubes may be centrifuged at up to 2000xg. Polypropylene tubes withstand higher forces, up to 4000xg. Sterile, RNase, DNase, pyrogen and cytotoxin free Available in Polypropylene or Polystyrene Dual-Position Plug Caps Compatitble with all standard equipment