We now offer these USA Made Durabond Coated Cam bearings. These are coated with a fluoropolymer composite coating which a dry lubricant that actually penetrates the surface. The primary advantage being it retains engine oil on the surface, even under extreme heat and pressure conditions. Being a lubricant itself, the coating provides secondary (back-up) lubrication in the event that momentary oil strarvation occurs, especially important during start-up. A step up from the standard cam bearings for those higher budget builds.