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. The bottom is even and flat to ensure the safety of the blade. , The sample bottle has writable spots, and can be scaled with 0.5, 1.0 and 1.5ml graduations. Rated 4.7 /5 based on 368 customer reviews.