1.Premium materials: highstrength metal spring, strong elasticity, durability and stability. The exercise is smooth without hanging out. The outer leather covers the metal to prevent sports injuries. The handle is made of thickened antislip foam, which is both nonslip and comfortable. Three levels of strength to choose from to meet different exercise needs. 2.Twist arm trainer for men: The muscle training bars differ from a traditional arm training bar in that it stimulates more muscle groups, including chest exercises, wrist exercises, arms, back, legs and shoulders. You can get a stronger body by simply following the standard instructions. It is easier and r, making it the right choice for home gyms. 3.Strength Training Device:U torque stick as your personal workout trainer and help you get a killer chest workout. The strength bar trains multiple muscle groups with precision, including chest, arms, biceps, abs, shoulders and back and hamstrings. 4.Adjustable spring design: Three adjustable levels of spring resistance, can choose the appropriate intensity for training according to personal needs. It is suitable for different strength requirements, improves wrist, biceps, chest and other muscle exercises and improves muscle strength.