Yellow 3-5lbs - extra light. Idea for injury rehabilitation or after surgery to gain strength and mobility.
Red 6-7lbs - light resistance. Ideal for yoga, pilates, stretching and strength work.
Green 8-9lbs - medium resistance. Ideal for yoga, pilates, stretching and strength work.
Blue 10-12 lbs - heavy resistance. Ideal for strength work.
Black 12-14 lbs - extra heavy resistance. Ideal for strength work.