Bob Reeves DR ORCH vs Kelly SKY-SS

The Bob Reeves DR ORCH has a wider cup diameter, the Bob Reeves DR ORCH features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bob Reeves DR ORCH
    • Trombone
    Cup diameter25.55 mm
    Cup depthMedium
    Rim width
    Throat diameter
    Backbore
    Finish
    Material
    vs
    Mouthpiece B
      Kelly SKY-SS
      • Trombone
      Lead
      Cup diameter24.64 mm
      Cup depthShallow
      Rim width
      Throat diameter
      BackboreS
      Finish
      Material316 Surgical Stainless Steel
      Best suited for
      📋Professional lead trombone

      Cup Diameter

      The Bob Reeves DR ORCH has a cup diameter of 25.55 mm compared to 24.64 mm on the Kelly SKY-SS — a difference of +0.91 mm. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      The Bob Reeves DR ORCH has a medium cup while the Kelly SKY-SS has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      Material

      The Bob Reeves DR ORCH is described as unspecified, and the Kelly SKY-SS as 316 Surgical Stainless Steel. Material affects mass, warmth, and how quickly the piece responds.

      Which is better?

      Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.

      Open in interactive tool + Add third mouthpiece Bob Reeves DR ORCH details Kelly SKY-SS details Bob Reeves DR ORCH equivalents Kelly SKY-SS equivalents