This is a triple string retainer made by Guitar Works. It's a convenient item that eliminates buzzing on all plain strings. It's a good deal, as a new one costs over 2,000 yen including shipping. *Returns and refunds are not possible due to the buyer's circumstances after shipping (e.g., not reading the description carefully, no longer needing the item). Please understand. *Due to the nature of the product, some modification or adjustment to your guitar may be necessary.