Falcon® 12x75mm, 5 mL high-clarity polypropylene (PP) round bottom test tubes have a 3,000 RCF rating. The tubes come with polyethylene dual-position snap caps, which offer both vented and fully closed positions. The sterile tubes are sold 25 to a pack and 500 to a case. RNase/DNase-free. Widely used and referenced in laboratory protocols Dual position snap-cap prevents sample loss with ease of handling Sterile, nonpyrogenicity tested to less than 0.1 EU/ mL