The MTC Bio C3215-SG ClearSeal 1.5ml Microcentrifuge Tubes with Attached Caps, Sterile, O-Ring, 12.8 X 47.6mm, 50 Per Bag, 20 Bags per Case, Pack of 1000, are made from ultra-clear polypropylene. The MTC Bio C3205S tubes are made from ultra-clear polypropylene and assembled caps with silicone O-rings that assure a leakproof seal from -90°C to +121°C. All ClearSeal™ screw cap microtubes are sterile, RNase, DNase, & pyrogen free and may be centrifuged at up to 22,000xg*.

*Refers to liquids with a specific gravity of 1.0, using appropriate rotors, cushions, and adapters.