FalconĀ® 17x100mm, 14 mL high-clarity polypropylene (PP) round bottom test tubes have a 3,000 RCF rating. Each tube features printed white graduations and a white writing patch. 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.