The samples were marked using a 20 watt q-switched ytterbium fiber laser with 160 mm focal length lens. The carbide parts were surface etched, to create brightly contrasting light marks on the material. They were marked using approximately 11 watts of power, with a frequency of 30kHz, at a speed of 15 inches per second, resulting different cycle times according to length and size of text. The large bit had a cycle time of 1.2 seconds. The medium size bit had a cycle time of 1.46 seconds; and the small bit had a cycle time of 0.3 seconds.