The Redline Extreme Bungee Shock Absorber uses 2-5/8" shock cord and can be used in a variety of ways when working dogs on a tieout or for pole work.The Redline Extreme Bungee Line is built for Heavy Duty Dogs! The Extreme Bungee consists of two 5/8" lines combined for a total of 1-1/4"! Used by many of the top trainers in the dog sports, bungee lines offer many unique drive building methods for young dogs to seasoned adult dogs. But these aren't your average Bungee lines! The Redline Bungee lines are unique and superior to many other bungee lines on the market. We have a special manufacturing process that takes the high quality shock cord and inserts it inside tubular webbing. The webbing is then bunched up to allow the line to stretch out and knotted off with the shock cord. Nylon webbing color may vary.