This product is a trombone water key cork stopper, made of safe and gentle cork material, with a mild texture, light weight, safe and odorless, and easy to carry. It is made with excellent workmanship, and practical, and can be well used in the trimming of trumpet, cornet, and trombone. This is a very practical instrument replacement accessory that will bring you a lot of convenience. Features -Color:Khaki -Material: Cork -Size: About 0.90X0.90X0.40cm/0.35X0.35X0.16inch -Preferred materials, good , safe, durable and practical. -Lightweight and portable, easy to use, convenient for you to use at any time. -With simple design and practical functions, it can provide you with a good experience. -The product is in workmanship and easy to replace, making it a perfect substitute for the trombone. -You can buy this and practical trombone water key cork at an . Package list: 5 x cork plug