We have been using these bearings on our house cars and the results speak for themselves. Under a microscope even finished surfaces have microscopic imperfections. Our Pro-Glide treated bearings are coated to fill those imperfections, which reduces friction and increases overall performance. The only lubrication we use with these bearings is just a few small drops Tri-Flow. The complete set includes 4 rear bearings and 4 front bearings.