Helps exercises such as pull ups, chin ups, ring dips and muscle upsGreen BandSize: 2080x4.5x45mm - Large (100-120lbs)Purple BandSize: 2080x4.5x32mm - Medium (50-80lbs)Black BandSize: 2080x4.5x22mm - Small (25-50lbs)Red BandSize: 2080x4.5x13mm - Extra Small (15-25lbs)Sold as 1-piece