Power Twister Bar Super Heavy Duty Upper Body Arm Strengthening Gym Home-Best Heavy Club Swinging Option (60 KG (Trainer)) Weight:20kg,30kg,40kg,50kg,60kg for your choose High grade steel with molded plastic grips Until Now Max Springs Power 60 KG to Challenge your Extreme Materials:Quality Carbon Steel Springs and Non-Slip Plastic Handle Perfect for building upper body strength