These 49'2 35/64" S-Power sling rolls come in two types. They produce incredible progression and constant power over the long term. S-Power slings provide unparalleled progressive thrust and retain their power better over time. Latex material and a special production process ensure the slings retain their elasticity up to the breaking point. They are machine elongation tested, ensuring each one arrives at its splitting or drying stage three to four times slower under equal usage conditions.Materials: LatexWarranty: Two year limited