Ultra Clear 100% Virgin Polypropylene (Tube and Cap), Ethylene Propylene Rubber Diene Monomer (O-ring) Packaging: 500 x pk, 10 pk x cs, 5000 x cs. Single Bagged. ZipLock bag. Clean Claims: Sterile Electron Beam, SAL 10-6 Free of: Rnase/Dnase, Human and Mouse DNA, Pyrogen, Endotoxin, Bioburden, ATP & PCR Inhibitor: Max. Torque