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 in charge of mouthpiece designs for players like John Faddis. This model is a very valuable 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 has only minor insertion marks and is in very clean condition. It has been treated with GAT processing, which allows for very easy breath and control. Mouthpieces have become quite expensive due to rising prices, and this is a very good deal considering the GAT processing. I will ship via Takkyubin Compact. Thank you for your consideration.