Easy to use device designed to massage muscle tissue. Encourages increased circulation to muscle fibers prior to exercise, disperses lactic acid after workout and diffuses muscle stiffness and knots. Three sizes to accommodate all body types. Wt. 2 lbs each. Marathon Stick - Flexible model is 20 long with 10 rotating spindles for individuals with lean body mass. Original Body Stick - Original model is 24 long with 15 rotating spindles for individuals with average body mass. Big Stick - This model is 30 long with 18 rotating spindles for individuals with heavy body mass.