For sample marking on ball bearings, we applied marks with two different procedures for demonstration purposes: laser engraving on the outside, laser annealing on the inside circle. Both markings are robust and durable. For heavily used metal substrates like some bearings, the preferred marking method is often laser engraving, because the marking remains readable even in highly abrasive use.
Musical instruments often get marked with company logos, serial numbers or other information. Different marking systems are utilized, depending on the material.