This Weight lifting Arm Blaster is made of top quality lightweight aluminum without screws for biceps and triceps curls isolator. This will not bend as it is made of thick gauge aluminum. The arm curl blaster makes maintaining the correct technique easier and as such the workout is more effective. It keeps elbows locked closer to the body to avoid swaying, which forces your biceps to do all the work. The contoured plate isolates arms and shoulders while keeping back and elbows locked in position for curling exercise.