Umm the plastic ones are Polyurethane. Id be willing to make a set for some1 to try maybe i could offer these if they work out good. The brass ones will last alot longer than needle bearings imo. My stocker zilla has all brass bushings in all the shock when i redid it all the shock bearings where shot and where $$$$ to replace so i made custom brass ones with new pins and they worked fantastic. On my drag bike the a arm bushings dont have any steel pins in them.... they pivot on the bolts the bushings fit snug into the arms and the holes in the bushings are same size as the bolts they are Polyurethane light weight but then again thats on a drag bike.