Borosilicate glass (low impurity Type I Class A) with snap-on cap and pre-inserted PTFE/silicone septum. The snap cap style is ideal for high volume labs that require fast and easy sample preparation. Vial size is 12 x 32 mm with no writing patch. 100 vials and caps per pack. Use with any LC or GC autosampler rack for 12 x 32mm 1.5mL/2.0mL vials.