Riffe's Power Bands are made of "Gorilla Rubber", the highest modulus power band material available. Our formula of natural latex with inhibitors generates consistent performance and resilience. Proven again and again to deliver the punch to catch World Record or prize fish for consumption. Powerband includes 2 layers of double woven sheath 1000 lb. test Spectra Wishbone Line. Latex is a natural rubber product. For prolonged life, remove bands from speargun and store in this resealable bag in a cool, dark environment when not in use.