ArcticIce tubes have high contrast black 100 µl graduations and large white labeling surfaces.  Internal thread caps have silicon-rubber o-rings for use in vapor phase liquid nitrogen.  Temperature range -196°C (vapor phase) to +100°C.  All tubes are sterile and are made in the USA from medical grade polypropylene with HDPE caps.  USP Class VI approved.
ArcticIce tubes are supplied in convenient self-standing, tamper evident resealable bags. 
Made in the USA.