5 ml, Clear, 500 Pack features: sterile comes standard by electron beam radiation self-standing bag with gusseted bottom stop-pops supplied 10 cap locks in every bag. All sureseal s tubes are rnase, dnase and pyrogen free. sureseal s tubes are manufactured under clean room conditions, using only bioclear co-polymer, an advanced polypropylene that maximizes clarity, centrifugal strength tested up to 28,000xg and the usable temperature range -90c to +121c. MTC Bio Microcentrifuge Tubes with Cap & Bags of 50 Tubes, Sterile, 1.