Shop › 7 Shank Collection (Square Port) Image 1 of 1 7 Shank Collection (Square Port) $129.00 Professionals Choice; Square port mouthpiece; 6 1/2” 7 shank. Get notified by email when this product is in stock. Add To Cart Added! Professionals Choice; Square port mouthpiece; 6 1/2” 7 shank.