Laskey 57MD Trombone Mouthpiece (Large Shank) GAT Treated Brand: Laskey Model: 57MD Inner Rim Diameter: 25.7 Cup: Medium Deep Throat Diameter: 7.14 Laskey is a manufacturer founded by Scott Laskey, a former Schilke craftsman who was responsible for the mouthpiece designs of artists like John Faddis. This model is a very rare one that is no longer in circulation due to the passing of its creator, Scott Laskey, in 2018. I purchased this item from the previous owner in beautiful condition and have used it a few times. It is in very clean condition with only minor insertion marks. It has been treated with GAT processing, which I believe allows for very easy breath control and is easy to control. Mouthpieces have become quite expensive due to rising prices, and this is a great deal considering the GAT processing. I will ship via Takkyubin Compact. Thank you for your consideration.