Natural Polypropylene Non-Sterile Grad Lines: Yes Volume: 1.7 ml Temperature rating from -80C to 121C Positive seal design allows for repeated cap closures and eliminates pressure induced popping of caps Autoclavable Certified RNase/DNase Free Certified Human DNA Free Certified PCR Inhibitor Free Certified Pyrogen Free 500 Tubes/Bag, 10 Bags/Case