Protect your connections with the Quick Cable Dual Wall Heat Shrink Tube Kit. With a 4:1 shrink ratio and the most adhesive sealant of any heat shrink tube on the market, this kit offers the ultimate protection for your connections. Each kit includes 6" cuts of black and red heat shrink tube in assorted diameters ranging from 1/8" to 3/4". Don't settle for less when it comes to sealing your connections - trust the best in the industry with Quick Cable.