The newest addition to the ClearSeal™ line is made of 100% natural/colorless polypropylene with no markings, dyes or metallic content and they conform with FDA 21CFR. In response to popular demand for diagnostic sampling and reagent packaging applications, color coded caps are also available. The silicone O-ring ensures a leakproof seal throughout the temperature range of -90°C to +121° C. All ClearSeal™ tubes are RNase, DNase, pyrogen/endotoxin free and may be centrifuged at up to 22,000xg. Dimensions 13.1 x 46.8cm. • Ultra-clear polypropylene • Non-graduated • Resealable bags of 50 • Leak-proof O-ring seal • Sterile, RNase, DNase, Pyrogen free