DescriptionWhen it is flattened in trumpet bending pipe or piston area and affect the tune, you need to use the appropriate specifications of the sheet metal ball, put into the flattened areas and press it up. Easy to operate.Features-Color:Khaki -Material:Alloy + solid wood -Size:21.30X2.60X2.60cm/8.37X1.02X1.02in -Made of alloy and wood material, durable for long time use. -Comfortable handle, polishing craft without burr, no hand injury. -Simple shaping, beautiful and fashionable. -Small size, lightweight and compact, easy to carry. -Can make a great assistant for music instrument repairing.