1.5ml Tube 100pcs/box 1.Due to 2D coding system with unique image forming, used for sample base management, especially for liquid nitrogen ultra-low freezers.Self-standing, Transparent, Writing-space. Made of imported medical-grade PP, it could use from -196°C to 121°C, and repeat freeze-thaw cycles.No DNA, No RNA, No Esotoxin, Gamma ray sterilization available O-ring in the caps, with perfect tightness and avoid pollution of the samples.