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 *