You're correct, those are lining strips. This document may help: http://www.international-pc.com/products/lini...atings.pdf

http://www.pbclinear.com/FL-(Inch)-Closed-PTF...b=CADModel

As far as the color scheme of the folders is concerned, you may be on to something. There was DD posted here recently on the board, of an email discussion between Bill & an investor regarding the different categories of bearings the company can make and what category they fall under. If only I could find it..