The solid cone rubber stopper has a variety of uses, such as being suitable for flasks, test tubes, or other laboratory applications. But we found that they are the best safety plugs for pepper shakers, salt shakers, and small pepper shakers. Our rubber plug has three different sizes, 000#, 0.31-0.51 inch, 15 pack; 00#, 0.43-0.59 inch 7 pack; 0#, 0.51-0.67 inch 5 pack. Basically suitable for all pepper shakers, salt shakers, and other small household seasoning bottles. The tapered rubber stopper can seal the bottle tightly by gently inserting it, and it can also be taken out easily, which is practical and safe. If you want to keep your pepper, salt, and other seasonings from being contaminated by moisture, air leakage, and dust, you must choose our white tapered rubber stopper.