High-quality material, hard and wear resistant, not easy to rust and deform. Anti-slip handles for great comfort and firm control, so you don't have to worry about hurting your hands in work. There are 9 kinds of beads with different sizes, which can repair various dents (mainly the repair of the bent neck). The ball is made of stainless steel and has been hardened to make it strong and not deformed. The small sheet metal balls are used for the alto saxophone and large ones for the tenor saxophone. You can choose the appropriate sheet metal ball size according to the degree of depression of the tube body. These tools are very suitable for wind music lovers, professional saxophone players, perfect for professional instrument repairman and instrument loves. This sheet metal set has a wide range of applications, not only limited to saxophones, but also can be used for other wind instruments, such as French horn, trumpet, trombone.