Bach Genuine Trim Kit Gold Plated GP Price: ¥125,000 This is a Bach trim kit. Piston buttons Top cap Bottom cap Water key 3rd valve slide stop rod and nut Installation wrench Set screws How about upgrading your instrument? In my personal opinion, when installed, the gold plating seems to make the sound more cohesive and brilliant. I think you can also enjoy the change in playing feel. Also, the appearance becomes more luxurious, which is good for motivation. Please understand that this is a used item before purchasing. Thank you for your consideration. ~~~~~~~~~~ bach back trim kit trim kit gp gold plating stradivarius 180ml 37 yamaha yamaha