CanDo is licensed to use the Thera-Band color sequence so resistance level is easily identified. Available in 8 levels of resistance for progressive exercise. Levels range in order of strength from least to greatest resistance: tan, yellow, red, green, blue, black, silver, gold. Uniform width - each band is 5" wide. 50-yard rolls have a core that fits most dispenser racks. CanDo® low powder exercise band is made of natural rubber latex, which may cause allergic reactions. For those with latex sensitivities, there are latex-free alternative offerings of CanDo exercise band.