This is a practice tool called "Upsound" that is used with a mouthpiece. I bought it because it allows you to practice with a feel closer to playing an instrument than just buzzing on a mouthpiece, but I'm selling it because I haven't used it much. I have washed and stored it after each use. Although I haven't used it much, there are some minor scratches, blackening on the metal parts, and dirt. It can be used without any problems, but please judge the condition from the images. Before listing, I polished it with silver cleaner and wiped it with alcohol wipes, but if you are concerned about hygiene or are a perfectionist, please refrain from purchasing. Also, this is for French horn. The contents are the items in the images and a simple instruction manual in the drawstring bag. From the official website: UPSOUND is a practice tool that allows you to practice anytime, anywhere, with the feeling of playing the instrument itself, instead of just practicing with a mouthpiece. It allows you to practice with a feeling as if you were playing the instrument in a natural state, and has the same effect as practicing while playing the instrument. In addition, UP SOUND transmits vibrations to the grip, which are then transmitted through the hands and arms into the body, resonating from the inside to the player's ears. It is also effective in memorizing the correct lip vibrations in the body and smoothing the flow of breath. It is also excellent as a tool for mastering the ideal way of breathing, and you can learn how to breathe correctly. After practice, it can be disassembled and washed with water, so you can use it cleanly. Brass band orchestra chamber music wind instrument practice Breath training mouthpiece Horn HORN Hr