This is an unplated Yany Booster. It's for Yamaha instruments. It can be attached in three ways to suit your needs. It enhances the sound, and you'll be surprised at how much the tone changes just by adjusting the screws. I bought it three years ago, but I haven't used it for even a month because I changed instruments. It doesn't have the original packaging, so I will pack it for shipping. Retail price: 8,800 yen (tax included) Amazon price as of 2/4: 7,390 yen Please refrain from purchasing if you are overly concerned about minor details.