From the Manufacturer

Tie In Power Bands are used for spearguns that do not have a band slot at the muzzle area. This means you have to "tie" the bands closed after one side is inserted through the band opening. These are made to be used with Riffe's New Marauder Series wood spearguns but may also be used with any speargun on the market.

Riffe recommends a "buntline hitch" knot to close/finish off Tie In Power Bands.

Always Fresh, made of the highest modulus rubber available. RIFFE Rubber Power Bands for spearguns also contain antioxidants for longest life.

Riffe 5/8" (18mm) Tie In Circular Corded Speargun Band Features

•  Tie In Circular Corded Band
•  Rubber Black Band
• Highest Modulus Power Band Material Available
• Always Fresh, Contain Antioxidants
• Special Antioxidants Help Protect Against Harmful U.V. Rays
• Dual Sheath Spectra Wishbone
• Wishbone w/1000 lbs. (453.6kg) Test Strength
• Great Choice for Closed Muzzle Spear Guns
• Spare or Replacement Part
• For Riffe Marauder Spear Guns (see SKU: RIFMRS)
• Great Save-A-Dive Kit Item
• Always Carry Spares
• The-Dive-You-Save, Just-Might-Be-Your-Own