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Fitness Resistance Tube Band Set with 5 different color and resistance level, all exercise bands are 48" in length, they are double layered and carefully constructed and can be used alone or stacked in any combination to a maximum equivalent of 150 lbs. Made of extra strong cord which is extremely durable and protective. And each tube band is color-coded for instant recognize ability, but we still label each one with the equivalent weight for your convenience.