TheraBand FlexBar Hand Exerciser 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. TheraBand FlexBar Green is ideal for those suffering from tennis elbow pain, looking to increase flexibility and range of motion, and to strengthen the elbow, wrist, forearm, and hand. Clinically researched and proven to reduce elbow pain by 81% and increase strength in the tendons by 72% in tennis elbow patients. FlexBar is portable and convenient exercise, rehab, and injury prevention equipment, packaging includes detailed exercise instructions.