Gold-plated trombone mouthpiece, model GP6L - Brand: GRIEGO - Model: GP6L - Material: Gold-plated - Type: Bass trombone mouthpiece - Color: Gold Thank you for viewing. I purchased this around March 2024. The original purchase price was around 37,500 yen. After requesting gold plating, the total cost was approximately 55,000 yen. I had the plating done at the time of purchase and have stored it, using it on and off for about a year. There are shank scratches from use, but otherwise, there are no scratches, and I believe it does not affect performance. Cup inner diameter: 29.02mm Rim outer diameter: 39.50mm Throat diameter: 7.77mm It's a slightly larger size, but it's light, so it's not heavy, allowing for long hours of playing and balanced sound from low to high notes.