Thank you for viewing. This is an MK trumpet tuning slide for BACH 180ML. It is silver-plated and features an Amado water key. Response and sound projection are dramatically improved. Please search "net brass" for detailed dimensions, playing feel, and sound. Adjustment may be required if it is difficult to insert due to individual instrument variations. There are some scratches, but there are no major scratches or dents that would interfere with playing. Please refrain from price reduction comments. Instant purchase is OK. If you are interested in used mouthpieces or new mouthpieces, please search "net brass". net-brass.com #trumpet