Our unique latex formulation and dip manufacturing process delivers radical modulus strength. The power curve increases as bands are stretched for optimum performance. Special anti-oxidants help protect against harmful U.V. rays, prolonging sling life. Wishbones are made of 302 stainless wire and provide superior strength and durability. 400 series bands feature a unique blue outer layer. They feature a 5/8" outer diameter and pack more punch than the standard 9/16" bands.