KYLIN SPORT Dumbbell Barbell Thick Hand Grips Arm Builder for Increased Muscle Mass Strength and More Effective Arm Upper Body Workouts (1 Pair) Transform any regular dumbbell, barbell, pull up bar, push up bar, cable attachment or any other bar into thick bar training for only a fraction of the price. Grips will double the size of the bars. Thicker grips helps grow and add muscle and strength to upper body, specifically your arms, quickly and effectively. Gain more mass from your weight lifting Simple design to convert any bar into a thick bar in a matter of seconds. One size fits all system, and easy to carry so you can take them anywhere. You'll never miss your thick bar training. Ergonomic Design fits into hands and the palm and easily adjusts for use with barbells, weight bars, pulldown ropes, and kettle balls. Made with heavy duty materials that are durable and will never compress or slip. Increase the power of your forearm, tricep, bicep, and chest workouts. A thicker handle boosts your muscle stimulation which translates to bigger muscle mass and strength in your forearms, hands and the entire upper body. The size:2 inch (5 cm) thick when closed, 4 inch (10 cm) long,1 inch (2.5cm) inner diameter, That's big enough to fit your hands and small enough to have a snug fit in virtually every dumbbell.