7" Cheeks, 5" Mouth. The Black Tie with its "no pinch" ball design is one of Reinsman's premier designs. The smooth swiveling cheeks help moderately control shoulders and ribs. The 1 7/8" Square Port Correction allows for different contact points on the palate than a regular correction port. The square correction has some tongue relief with limited palate pressure and more bar pressure. This bit is a good choice when looking for a change from the standard correction port.