This is a modified Kessler custom mouthpiece checked by Dave Kessler. It came with my Kessler custom alto sax. I had it refaced, the tip opening is .65, 19mm facing and tip rail was thinned out. It is very direct and easy to play. Has some ligature marks, otherwise in excellent condition. Sold as is. Free shipping within the US. Please feel free to contact me with any questions, thank you for your interest.