Aijiren’s Snap Top Chromatography Vials are made of transparent or amber type 1 borosilicate glass (Grade A, 33 expanded borosilicate glass). The Snap Top Chromatography Vial can accept either aluminum snap-on seals or polyethylene snap-on caps. The colors are white, red, and blue. You can choose from them, which is very suitable for short-term storage.