- Standard series - Outer diameter: 27.23 mm (1.072") - Inner diameter: 16.59 mm (0.653") - Cup shape: Medium C cup - Relative cup depth: 6 - Shape of the backbore: S - Silver-plated - Comparable to Bach 3C, Warburton 4MC or Schilke 14B EUR 153.00 - See more - Buy online