Size 2 Pure Gum Rubber Stopperswill plug bottles, lab vials and other openings. Pure Gum Rubber useful to 220º F and in applications with moderate chemicals, alocohols and organic acids. Do not use with strong acids, fats, grease or hydrocarbons. Not for food or beverage packaging applications.
Great stopper, high quality material. However, I do need a size up for my bottles (lol oops) but i will be purchasing more in the future.