Quote Originally Posted by Jonathan View Post
The profile rails with 4 rows of balls is what you should look for.
Aha! Now you mention it I seem to remember reading that somewhere. I tried to check out the PDF links from the Zapp website but the links are screwed for that product, I'll have to hunt them down seperately.

Is the number of rows something that is usually advertised with them, or is it a matter of hunting down the specs for each one to check?