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 resistance from least to greatest resistance: tan, yellow, red, green, blue, black, silver, gold. Uniform width - each band is 5" wide. CanDo® low powder exercise band is made of natural rubber latex, which may cause allergic reactions.