This is a Bach 7S mouthpiece, likely purchased about 10 years ago. I bought it to try out a heavier mouthpiece, but I've only played it a little, just to test it. It's been left unused for the most part, so it has the characteristic black tarnish of silver. Here's the manufacturer's comment: French Horn Mouthpiece ■ 7S ■ Cup Depth: Medium-Deep ■ V-Cup ■ Rim Diameter: 17.25mm ■ Throat: Approximately 4.6mm ■ Larger throat and backbore than the 7 ■ Easy to blow, with a soft tone.