Hammerhead Spearguns, Helix Power Pre-tied Band 5/8 or 16 mm Universal Replacement for all rubber powered spearguns. Ability to loop pre-tied ends into muzzles holes with-out slots. or with-out removing band slot spacers. Easily replace worn-out or frayed wishbone bridels, extending the life of your band. Quickly tie or untie the wishbone bridle with a simple sheet bend knot. All X-Power Bands are hand tied to HammerHead Speargun specifications utilizing quality US components.