Thera-Band� FlexBar� is a flexible durable resistance device with a ridged surface for enhanced grip during use * It is used to improve grip strength and upper extremity stabilization by bending twisting or oscillation movement * It has been research-proven effective for Tennis Elbow offering a cost-effective treatment that requires no injection or expensive equipment * Thera-Band FlexBar is 12 long and is made from dry natural rubber in 4 progressive resistance levels to match user capability. The Yellow Thera-Band FlexBar takes 6 lb. of force to bend to a u-shape *