Big Mike's Fitness Grips Extreme Barbell Thick Muscle Builder Product specs: measures 2"thick x 5"long Allows for a good grip High density rubber: makes it lightweight, doesn't compress even with heavy weight, high density rubber material allows it to last a long time Grip strength: building bigger grip equals larger and stronger muscles which has a huge carry over effect across exercises and modalities Anti-slip rubber: made of high-quality dense non-slip rubber