Made from the highest quality latex rubber from the largest manufacturer in the united states. Always black over amber to provide the highest elasticity as well as UV protection. This insures you the highest longevity of your power bands. Wishbones are constructed of 1000lb triple core dyneema to provide you with the strongest possible resistance to abrasion. All Koah Power bands are individually hand tied. Power bands are guaranteed. If your wishbones ever pop from the latex rubber we will replace it with two.