From Pull-ups to Presses and Curls to Squats, the Lebert F.A.T. Bands are the quintessential workout accessory for all levels of fitness. 1/2" RED-Mini (13mm) 15-30lbs Resistance 3/4" YELLOW–Small (19mm) 20-45lbs Resistance 1-3/4" GREEN-Large (44mm) 35-75lbs Resistance