Marine grade heat shrinkable butt splices. 99.9 % pure copper with seamless tube, tin plated. Proprietary nylon/polyolefin 3:1 shrink ratio tubing with adhesive lining provides maximum clarity for wire inspection purposes, faster shrink times and improved abrasion resistance. Simply insert the wire, crimp and heat shrink for a complete environmental seal. Includes 10 each 22-18, 16-14 & 12-10 sizes.