He should be rather running this as a GB through Gateron for lasered POM and dyesubbed PBT as nubs says. The price is sort of okay, but if you're going to all this trouble for a custom set, why not make it a NICE custom set that you'd much rather use than the stock caps on any board.
I'm not registering in either of those places just to tell him this, though, so hopefully someone else does, or at least points him to this thread.