Falcon™ 17 x 100 mm, 14 mL polystyrene or polypropylene round bottom test tubes. 1400 RCF rating for polystyrene and 3000 RCF for polypropylene. Polystyrene tubes have molded graduations. Polypropylene tubes have printed graduations with writing patch. Sterile. Provides reliable containment of laboratory fluid samples. Falcon™ tubes are widely referenced in published procedures and protocols. Polystyrene tubes are best suited for procedures requiring high optical clarity. Polypropylene tubes are best suited for applications requiring greater thermal and chemical stability. Dual-position snap caps with heavier gauge walls and unique construction provide a secure, positive seal.