This is a newly released acrylic mouthpiece from François Louis in 2024. The shape is exactly the same as the traditional rubber (Grounds) mouthpiece, with only the material being different. SP (Sphere) chamber, TM285. Compared to the rubber type, it contains more high-pitched overtones, allowing you to enjoy a refined yet gritty sub-tone sound. According to the François Louis website, in Japan, new products seem to be handled only by Ishimori Wind Instruments, but according to the staff, there are no plans to stock the Amber version, making it a relatively difficult mouthpiece to obtain. According to the François Louis website, the new price is 409 euros (approximately 75,000 yen). (It has increased slightly in price over the past few years) Reference: https://francois-louis.com/sales/prices Please give it a try.