BlackJack offers repair refills (tire plugs) in both self vulcanizing and chemical-cure design. The chemical cure is designed to be used with any of our cements and our self vulcanizing inserts do not require any cement. We also have a one step repair that has the insert attached to the patch. See our patch-plug combination units. We have designed these refills for your convenience and savings. Inserts are available in a variety of sizes, shapes and designs.