This is an original power band for a single-pull spearfishing spear. This set includes a sling rubber (outer diameter approx. 12mm x inner diameter approx. 3mm) and a simple Dyneema wishbone, designed for light spearfishing spears. How far you can pull it depends on the user's arm and grip strength, as well as the strength of the spearfishing spear itself, but you should be able to pull it to about 2.5 to 3 times its original length. For the Dyneema line wishbone, it is recommended to connect the longer end to the butt plate of the spearfishing spear and the shorter end to the hand strap (hand guard), as shown in the image. The wishbone line is made of high-quality Dyneema line, so it is resistant to abrasion and long-lasting. ※The hand strap (hand guard) in the image is sold separately, and the spearfishing spear is not included. ※After use, wash with fresh water and store in a cool place away from direct sunlight in a sealed container. ※Please remove any burrs from the butt plate hole before use.