Cando adjustable exercise band, 3 band set -yellow, red, green) the adjustable cando system is an easy-to-use, portable, light-weight, modular exercise system. The resistance of each band can be increased or decreased by adjusting length of band used. “quick-attachment” hooks can be attached to the “d-ring” making it the perfect accessory!! kit includes 3 bands -red, green & blue).