Falcon 50mL Polypropylene Conical TubesFalcon Conical Tubes 50 mL A standard in semen processing with density gradient or swim up techniques. Corning Falcon Conical Centrifuge Tubes are ideal for cell centrifugation; pelleting; separation by density gradients. Features: RNA DNase free Solvent resistant white writing area for writing directly on tube Sterilized by gamma irradiation, nonpyrogenic Supplied blue HDPE 20mm threaded dome seal closures provide positive seal over the full