Treadlife Fitness Assisted Pull up Bands - Crossfit - Choose Your Size! 1/2" - Red - Resistance is 20-35lbs 1 1/4" - Purple - Resistance is 40-80lbs 1 3/4" - Green - Resistance is 50-120lbs 2 1/2" - Blue - Resistance is 60-150lbs 3 1/4" - Orange - Resistance is 70-170lbs