Creatures of Leisure Deluxe Wrist Coil Leash Urethane was first introduced to the market by Creatures' John Malloy in 1976-Still regarded as the world's best cord material Bearing swivel (circa 2003)the world's first stainless steel, self-lubricating swivel: the swivel never gets stuck, eliminating leash tangles. It's also virtually unbreakable DNA flex mould (circa 2007) the world's first cord / mould connection to absorb wave impact-increases flexibility and strength and reduces breakage. Return rate near zero