This is a trombone accessory, specially designed for trombone watergate keys. It is suitable for many types and brands of trombone on the market. It can meet your long-term needs, with excellent quality, wear resistance and corrosion resistance. Features -Color: As shown -Material: Copper nickel, plated cork -Size: 5.90X2.80X1.00cm/2.32X1.10X0.39in -It is made of copper nickel-plated cork material, which is durable and can be used for a long time. - materials are the raw materials for its production, so this product is not easy to rust, wear-resistant and not easy to damage. -Excellent workmanship, quality, more trustworthy, and can be used with peace of mind. -The operation is simple and convenient, easy to install and use, easy to understand and easy to replace. - and low-cost, products are your , come and buy it. Package list: 1 x Drain valve