Fiberglass pipe insulation kit. 3 in x 1/2 in x 25 ft roll. Comes with 25 ft plastic vapor barrier. 1.6 R-Value. Package covers 17 ft of 1/2 in pipe, 12 ft of 3/4 in pipe or 10 ft of 1 in pipe. Stops sweating and dripping of cold pipes. Cuts wasteful heat loss on hot water pipes.