Dual-adjusting tube configuration, wider sound range. Unique integrated design of high-quality copper-nickel alloy is used for the key bar, which fits closely with the cone hole, flexible operation and more 3. Ergonomic, equipped with imported needle spring. Italian leather cushion, excellent elasticity and comfortable hand feeling, Flexible operation, pure and beautiful tone. 1Cleaning cloth (random color). 1Purging cloth dark blue.