I'm selling this because I didn't find it suitable after using it for about 3 months (this is just my personal opinion). There are not many scratches. The world's first pure titanium mouthpiece using M.I.M technology! Advanced metalworking technology M.I.M ――――――――――――――――――― "Pure Titanium" is the world's first brass instrument mouthpiece that applies "Metal Injection Molding (M.I.M)," an advanced metalworking technology. By introducing this new technology, we were able to reduce the price to about half that of conventional titanium mouthpieces. Furthermore, the high-density pure titanium, which is completed through high-temperature sintering in the M.I.M process, and Best Brass's unique acoustic design, represented by "groove processing," achieve a rich and fulfilling tone. It also solves the problem of conventional titanium mouthpieces, which tended to have a harsh sound.