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Good stiffness, high hardness, and good wear resistance are benefits of marble staircases. The accuracy is good because after extensive natural aging, the rock has a homogenous structure, a very low linear expansion coefficient, and the internal tension totally vanishes without deforming. Not scared of acid, alkali liquid corrosion, rust, or the need to apply oil. Maintenance is simple and easy, and the product has a long service life. It is not magnetic, can move freely during measurement, is not astringent or stagnant, is not affected by moisture, and has a clearly defined plane.