I didn't know anything about mouthpieces when I originally received this one from my high school band director. All I knew was that this, and it's small bore counterpart, were the best bari/euph mouthpieces that I had ever played on. Full, warm, and rich tone quality make it extremely desirable. Since I've played on these mouthpieces I've tried some others but never liked any other ones better than these. This is a real hands on product review by Sean at Sam Ash Indianapolis.