some or iron head description mention conform with rules of golf ,what about the other iron head
as Sparky mentioned, all USGA conforming clubs are on the link he posted.
In essence Golfworks/Maltby manufacture the clubs to be conforming, but not all have been submitted by Golfworks to the USGA for their blessing. You can submit clubs yourself, but from what I understand (when I attempted to) there is quite a backlog and it appeared they were trying to discourage me to send them.
In USGA sanctioned events and high level play (club championships) you may run into a problem, so it’s best to ask if your customer(s) will be involved in such play. A couple of guys on a league I’ve played in gave me a hard time, but after they watched me play and saw my scores (I’m a high handicapper), they quieted down.
My customers I direct towards USGA sanctioned clubheads to avoid any problem they might encounter.