This arm machine may help you improve in performance and may develop firm, smooth and toned arms. May make your body burn the stored fat and calories, may provide you with the energy needed for a workout session. 3 interchangeable resistance bands with three different colors, represent different resistance levels. Includes 15, 25, and 35 lb. Please use only one band for exercise. You may get a total arm workout with this resistance band system. May tone and sculpt arms, back, traps, and hard to reach areas while burning calories.