Looking to build up muscle strength and definition in your arms? The Metal Grip Training Device is perfect for targeting specific muscles groups and helping you achieve the results you desire. This hand grip strengthener is made with aluminum handles and spring steel for a durable, long-lasting design. It also comes with four different color options so you can choose the one that best suits your style. The 100lbs Fitness Heavy Grips Wrist Rehabilitation Developer is perfect for those who are looking to improve their overall arm strength and definition.