JBL Replacement Band w/ Wire Sling for Spear Fishing Spearguns JBL Replacement Band w/ Wire Sling for Spear Fishing Spearguns 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