Features: Exquisite workmanship and exquisite appearance, making it can fit 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 friend. Specifications: Component: Metal and Cork Size: about 21x64mm/0.83x2.52inch Package Includes: 1set Trumpet Water Key Drain valves note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.