Sureprep Capillary Tubes Tubes feature self-sealing plug and multilayered Mylar wrap Reduce exposure to HIV, HBV, and other bloodborne pathogens A channel in the system allows air to escape during filling; once the sample touches the plug, the channel seals automatically Simply fill the tube, hold vertically, then centrifuge and read In the event of accidental breakage, the protective Mylar wrap helps contain blood and minimizes exposure to glass fragments Non-sterile Clear 1.1 x 75 mm Additive: Heparin (Precalibrated) Glass Tube