CELLTREAT Scientific Products Non-treated 1000mL Roller Bottle. Large knurled cap for easy grip. Manufactured from medical grade virgin polystyrene. Easy-to-read black printed graduations. Non-Treated Roller Bottles can be used for suspension cell culture and large capacity liquid storage. Vent caps available separately for use with open systems. Non-vented cap. RNase/DNase free and non-pyrogenic. Every case is printed with the lot number for quality traceability. Packaged sterile, individual bag, 24/case.