I used this to replace the front brake discs on my Fiat Spider. Installation was easy enough and they fit perfectly with the odd 4x98mm studs that Fiat uses. The packaging is sturdy but easy to open. The rotors were very straight, with no noticeable wobble. The ridges and pits don't seem to help with normal riding, at least not initially, but the brakes seem to disappear a little less than before (I've also paired them with the new Wagner kit). ceramic brake pads).