Transparent glass bottle-amber glass vial made of USP Type I, Class A, 33 borosilicate expanded glass-made of USP Type 1 Class B 51 borosilicate glass. 2ml 11mm Snap Top Vial for THERMO FISHER Aijiren’s 2ml Snap Vial is made of high-quality USP I-type expanded 33 borosilicate transparent glass (USP Type 1, Grade A) or 51 amber glass.