The steel tongue drums of Hluru brand are made of high-end steel customized from the steel factory, which does not contain strong magnetism compared with the low-end steel in the market. The stronger the magnetism, he more iron (FE) impurities contained in the steel, and the easier it is to rust. For metal musical instruments, rust will greatly shorten the service life and bass
accuracy. At the same time, if there are too many iron elements, the metal properties will be too soft. The more likely it is to produce mixing sound when knocking, that is, playing the so-called "buzzing" sound or "knocking iron" sound.
