Size 11 Pure Gum Rubber Stoppers will plug food containers, 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.
I ordered NO.10 and 11 gum rubber stoppers. These were received as described within 5 days from the time the order was placed. The company has items which I could not be find elsewhere.