I had no idea what those things were in the pictur
Post# of 22940
http://www.pbclinear.com/Linear-Plain-Bearing...free-Liner
These are self-lubricating bearings (not sure if similar to what TPAC is making), but I noticed the Red, Blue, and Green color schemes, similar to the colors of the folders the liners are on in the tweets. It appears the colors signify some sort of standard of bearing. It also looks like the things in the tweets are what go inside the bearings, as shown in the link I posted.