Horn arrived with high pad provides support was hammering the point, line, surface, their reaction and hitting power of the composition forming the force or couple. Arrived pad location to be accurate, because it determines the type and location of deformation; high horn shape and size according to need to select, hand-held, there are fixed; have long, there are short; a round, well- ; the use of ready-made, have their own design and so on. High stiffness of the horn to big, not material not forming, the deformation of the first high-horn; high quality of the horn should be big, too small to play its easy to fly.