Horn Mouthpiece PHC AS Model [Rim Only] Inner Rim Diameter: 17.50mm Rim Width: 4.50mm *The plating on the inside is slightly thin and appears to have scratches. ・PHC mouthpiece allows for free combination by separating the rim and cup. ・By combining rims with different diameters and widths with the cup to match the musical style and condition, a variety of choices become possible, expanding the range of performance.