Willie's Montée α χ GP mouthpiece for large-bore trombones. This mouthpiece is a signature model supervised by Noboru Ogino (former principal player of the Tokyo Symphony Orchestra). The size is equivalent to Bach 6-3/4AL, and is recommended for those looking for a smaller mouthpiece. It uses χ metal, which contains a high copper content, and α material that has been heat-treated, making it a very rare item not found in the regular lineup. How about taking this opportunity? Based on the old Courtois Bequet model, it features a bright and light tone with a pure French taste and effortless breath. 《Specifications》 Rim Inner Diameter: 25.00mm Throat Diameter: 6.60mm Equivalent to 6-3/4AL α processing and χ (chi) metal are used for a rich tone while also providing excellent response.