Resistance Levels from 40-80 lbs (18-36 kg). Completely Customizable to Your Needs * Great for Assisted Pull Ups, Weight Lifting, Pilates, Yoga, and Stretching * 41" Loop Rubber band, more versatile and durable that your average tube band * Not sure which band is for you? Check out the description for help * 60-day Warranty with 100% Satisfaction Guarantee