brake pads as mine were showing some wear. Not bad, but I'm doing two cross-country trips in a row, one of which will be across the mountains and trails in jeeps around Ouray, Colorado, and I wanted to make sure I had good brakes. The delivery with Revain Prime was quick. Installation was easy. It took longer to source and organize the tools than replacing the actual brake pads. Only about 30 minutes per side (front and back). Had a few other minor things to do while the wheels were off but again a simple repair/replacement. The brakes were then ground according to the manufacturer's instructions. The brakes settled in well and worked well from the start, but as I put about 60 miles in a day they really settled in and worked better. A definite improvement over the stock. I would recommend anyone looking to upgrade their pads to try them. Like other reviews. They are good from the start, but over time they become great performers.