The Alexander size 8 horn mouthpiece features a high quality
  machine finish, cut to exact specifications. This 1-piece design
  has a base metal of brass with a silver-plated finish.
  - Rim Width: 4mm
  
 
  - Cup Bore 3.7mm
  
 
  - Cup Depth: 28mm
  
 
  - Internal Diameter: 17.5mm
  
 
  - Silver-plated throughout
  
 
  - One piece design
  
 
  - Tilz (European) shank taper