- Pro Line Concert Hall - Outer diameter: 27.48 mm - Inner diameter: 17.45 mm - Cup depth: 12.42 mm - Bore: 3.78 mm - Total length: 87.63 mm - Rim contour: Medium-round - Silver-plated - Comparable to Bach 1-1/2C or Storck 2C EUR 157.00 - See more - Buy online