Improve 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 — taking full advantage of a grueling arm workout.