Upgrading brake rotors is one of the most effective ways to improve braking. StopTech Direct Replacement Rotors are simply slotted rotors without the slots. This will make them less effective as heat will not easily dissipate, but they are perfect if you are just looking for an inexpensive OEM style replacement. StopTech Direct Replacement Rotors are fully machine finished, and built to OEM specs. If you want a big increase in performance, we highly suggest slotted rotors.