Since each tube is a different level of tension you can combine them to create 15 to 95 levels of resistance (depending on model). Here are all of the combinations and weight equivalents. The number to the left represents the starting resistance and the number to the right represents the ending resistance. Exercise tubes naturally become more difficult as you stretch them.
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Black elastic only included with Max Tension and Terrell Owens Set
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Orange elastic only included with the Terrell Owens Set