This is a JBL #220 Replacement Band w/ Wire Sling for Spear Fishing Spearguns These awesome bands feature: Replacement sling measures 9/16 in diameter and is 20" long Unique latex formulation and dip manufacturing process delivers radical modulus strength 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 either 302 stainless wire or Spectra cord, both provide superior strength and durability Easy user install #220 9/16" x 20" Sling for 6W44, 4D44, 4D22, 4W44 Breathe new life into your speargun with an awesome new band!