Horn Mouthpiece PHC AS18 Model [Rim Only] Inner Rim Diameter: 18.00mm Outer Rim Diameter: 26.92mm Rim Width: 4.25mm Rim Bite: Slightly Sharp Rim Counter: Round ・PHC mouthpiece allows for free combination by separating the rim and cup. ・By combining rims with different diameters and widths with the cup to suit the musical style and condition, a wide variety of choices becomes possible, expanding the range of performance.