Gymreapers Arm Blaster - RedImprove Form and Strength The Gymreapers Arm blaster is the forward progression of old school classic bodybuilding. Made from sturdy aluminum and durable nylon straps, this arm building mechanism is designed to be worn around your neck when performing bicep curls. By requiring you to keep your elbows tight against your body, the arm blaster stimulates a stronger muscle connection, promotes proper form, and aids in overall isolation of the biceps