I was looking for the S-30 power blades. The irons also have "tour spirit" written on them. I currently play MP 11 which I have had since 1992, however I am tempted to change to the S-30 power blades.
The S-30s have a slightly larger head, and of course the cavity back, which would probably help an old bloke like me. Pity they are no longer in production, as a custom grind with a satin finish would make the best set of irons.
Keep up the good work on the web site.