Features: Made from stainless steel, durable and not easily deformed. Easy to use and operate without the need for professional skills. Contains sheet metal Ball of various shapes and sizes, which can adapt to various concave situations. Suitable for instruments such as saxophones, horns, trumpets, trombones, etc., as long as the inner diameter of the tube is suitable and the sheet metal ball can be inserted into the tube, it can be used for concave repair, mainly for repairing bent necks. This tool can be used according to different needs. Suitable for professional or personal use. Designed for saxophonists, horn players, and enthusiasts of brass instruments, this dent repair tool set is a must have for instrument maintenance. Specifications: Material: stainless steel Long rod size: Approx. 6.5+23cm/2.56+9.05inch Ball diameter: 2.4/2.1/2/1.9/1.8/1.7/1.6/1.5cm Barrels ball size: Approx. 2x1.1cm/0.79x0.43inch Package Includes: 1x Long Rod 8x Ball 1x Barrels Ball note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.