This is an assortment of heat shrink tubing. It is packaged in 3 in. lengths. It's great for insulating electrical splices, and also covering electrical plugs and connectors. It comes in a variety of sizes and colors. It comes with 12 pieces of tubing qty. 2 of each size listed below. The tubing can be shrunk by way of a heat gun, butane lighter, or a soldering iron.