Drilled or slotted. Visually a great impact, killer in breaking performance when the right rotor is used. Don' t go cheap on these ones or you' ll be sorry very soon. Cheaper, inferior drilled rotors such as Zimmermann are known to be cracking on the edges 9 out of 10 times due to the inferior materials used. A original BMW rotor will out perform these discs with eyes closed. If you want optics and performance, for a reasonable price, do buy EBC as the guys suggested. These have the drilled/slotted optics but are not fully drilled through resulting in not cracking under any circumstances.The metal used is heat trated meaning the material is heated up to temperatures you will never reach whilst breaking thus no bent rotors will hunt you.
We use thes on the track and sprint days too and are very pleased with braking, non fading and duarbillity. One thing, do not buy redstuff from ebc if your car has ABS. It will not funtion propperly as this pad is just too hard.