Different resistance level to accommodate for progressive strength training levels:Yellow Band - Extra Light (10 LB)Green Band - Light (15 LB)Red Band - Medium (20 LB)Blue Band - Heavy (25 LB)Black Band - Extra Heavy (30 LB)Feature:Strong cushioned foam handles with Zinc alloy clips and D-RingEasily creating over 30 different resistance levels by attaching 1.2.3.4. Or all 5 bands to the handle.Perfect for Yoga, ABS workout(3Pcs)Package Content:1x Bands(10//20/30 LB)Optional2x Handles(11Pcs)Package Content:2x foam covered handles; 2x ankle straps; 1x door anchor;1x carrying bag; 5x Resistant Bands