[Upgraded Size & Comfort Grip] The new EAST MOUNT Twister Arm Exerciser is expanded to 17.5 inches, helping you maintain proper posture and form during every workout. Redesigned non-slip handles provide a more comfortable and secure grip, ensuring better control and performance. [Hydraulic Power Core Safer & Smoother Resistance] Unlike traditional spring devices, this arm trainer uses a reinforced hydraulic cylinder that delivers smooth, consistent tension through every rep. With controlled micro-rebound, it protects your joints, prevents sudden snap-back, and ensures long-lasting durability.