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It is common that when the biceps get tired, you subconsciously start to use other muscles for the lift, which causes extra swinging and the power of movement is diverted away from the biceps. With the Arm Blaster, you don't have to waste energy to keep your upper arm in place. The arm blaster helps to maintain the correct position throughout the workout, allowing you to get the most out of the last reps of the series as well. The elbow pads and neck rest are coated with neoprene padding for the most comfortable user experience. The strap is made of durable nylon.