Granpa's correct ("he may be an old man, but is yet a young motor tuner"- figure out that quote!), they are new 540J's that I tune for racing applications. I've been racing R/C for 2 decades and figured out some of the secrets of these silver cans years ago. When other tuners started to catch up to me, I went out and bought a bunch of specialized equipment and a couple cases of motors (most of which got ruined and were trashed) and learned the rest (or at least more of the rest) of the secrets.
For several years I just tuned motors for myself and friends, and sold a few to racers against whom I wasn't going to be competing. We won a lot of races. But now I'm older, my reaction times and vision are fading, and frankly even the fastest motor isn't going to help me out a whole lot.
So I decided last year that it would be entertaining to spread the power around to some discriminating racers who appreciate how difficult it is to make these little demons fast (really fast), know how to maintain them, and are willing to make the investment to win a few races.
I do a batch when the mood strikes me and I have the time- not really interested in getting in to the motor business, even though I suspect there's an enormous market out there.
Each motor is engraved with a unique number (so I can keep track of it while it's going through the tuning process and the buyer can tell it apart from his other motors) and has a red dot painted on the positive side of the can so you know where to solder the positive lead. Hence the name.
Interested folks find it easier to reach me at email@example.com
, even if they just want to chat about stuff like this or run their ideas past me. Feel free.