Bombers Broken Pelham Square TwistBombers Broken Square Twist Pelham with 130 mouth. The curved mouthpiece which distributes pressure more evenly over tongue and bars. With the offset center link it will reduce the nutcracker action and pressure points on the tongue. The Square Twist will create more pressure points on the mouthpiece which will make it stronger than the Round Twist and Smooth. The mouth piece is made from blue sweet iron that, oxidizes easily, encourages salivation