Are you still worrying about not finding the right trombone accessories? Are you still worried about the broken key in the incident? Let's take at our products, not easy to damage, and durable. It can meet all your needs. Features -Color:Silver -Material:Metal, Plastic -Size(1):6.50X2.20X1.20cm/2.55X0.86X0.47in -Size(2):2.50X1.20X1.00cm/0.98X0.47X0.39in - workmanship and appearance, making it can match well with all trombones. - It's easy to store because it's so small that it won't be inconvenient to carry out with you. - The design is simple but very practical, and the portable and humanized design can meet your urgent needs. - Easy to install and convenient to use. Fit for beginners and professionals to use, and easy to use. - You can use it for yourself or give it as a gift to beginners or friends. They will be encouraged. Package list: 3 x Valve 3 x Spring