I use one of these every time I get my labels engraved for my laser builds, they are fast, ours is a 15 watt model it will even engrave some metels and the bright metels we paint with a black substance that washes off but will let the laser ingrave it. it's all prety cool and if you have an extra $22,000.00 you can have one for your own label making projects, they are prob cheaper now we first bought one many years ago and have been upgrading it ever since, heck when we first bought it, it was only a 10 watt model.
Heres a pic of some of my labels made on our Co2 laser engraver.