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Fat Gripz, The Ultimate Arm Builder, are made from an ultra tough military-grade compound which is a lot like rubber (you might be surprised at the weight and quality of them when you open the box). They have a slit down one side which allows them to be pulled open and slid easily onto the bar and then close tightly around it. They will not wear out or compress and they are designed to be rock solid on the bar as if they're a part of it.
Fat Gripz instantly convert barbells, dumbbells, chin-up bars and exercise machines into "Thick Bars". Most people who train with Fat Gripz find that their arms size and strength (in particular) increases dramatically and, as a result, their whole upper body grows. You will literally feel them working the very first time you use them. Thick bars are simply barbells, dumbbells and pull-up bars with a thicker diameter handle. A standard bar typically has a handle with a diameter of about 1 inch. A thick bar will often have a diameter of more like 2.5 inches. Thick bar training produces much bigger strength and muscle gains compared to standard training equipment, and many people find them much easier on their joints too.