This is a variable thumb lever for Alexander 103 horns, manufactured by HMG Brass Instrument Technology. Using the included wrench, you can adjust the height and angle of the lever to your preferred position. Installation can be done with a Phillips head screwdriver, but if you're unsure, please ask a music store to do it for you. I didn't find it suited me immediately after installing it, so I haven't used it much. Please refrain from purchasing if you are overly concerned about the condition, as it has been handled by someone else. Retail price: ¥35,200 (tax included) This variable thumb lever for Alexander 103 horns is made by "HMG Brass Instrument Technology," a workshop located in the Kansai region. The HMG workshop is one of Japan's leading workshops, where the craftsman learned horn making at Helmut Finke GmbH in Germany and obtained a brass instrument making master qualification. This variable lever is recommended not only for those with small hands who find the Alexander original lever difficult to hold or operate, but also for all players as it is designed to fit the hands of Japanese people. In addition to the lever parts, the springs are also custom-made for optimal movement. The HMG sticker and the included wrench are also included. Since it is used, please understand that it is non-refundable and non-returnable.