1.5mL Clear Glass w/Caps and Pre-Slit Septa, 100/PK. Borosilicate glass (low impurity Type I Class A) with one twist cap and pre-inserted, pre-slit PTFE/silicone septum for ease of sample preparation and autosampler needle penetration. Vial size is 12x32 mm, with a writing patch on the side. 100 vials per pack.