what terry means is shown below :
the wheels have not been machined but the spacers have been made to be better as shown in pics below.
The wheels/bearings are just normal SDG but with recessed bearings to take a seal yes they are better than no seal but you have the rubber seals on the bearing also.
also if the bearing is machined then standard 6202rs will not fit but they have fitted fine to all stomp wheels i have worked on up to 2012
hope this helps