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CELLTREAT Flip Top & Snap-Pop Centrifuge Tubes are manufactured in a class 100,000 clean room and made of high-clarity polypropylene. Flip Top Tubes feature bold easy-to-read black graduation marks with large white marking area provides excellent contrast for identification. The ergonomic leak-free flip top & snap-pop cap designs allow for easy one hand opening of caps while preventing loss of a separate cap. Flip top caps are smooth, flat surface polyethylene. Snap-Pop caps have an audible snap when closed and a pop when opened. Temperature range is -80°C to 120°C. CELLTREAT 15 ml and 50 ml Flip Top Centrifuge tubes are available in either paperboard recyclable racks or bulk packaged in sterile re-sealable (zip closure) bags. Gamma irradiation sterilized, RNase-free, DNasefree, and Non-pyrogenic.