Carbon metallic-great stopping when your on the pedal,cold stop,give yourself some room.Also leaves black dust,but they wear foreever.Just chnged a set after 60k.Ceramic seems to be the new wave of future.First stop is just as bad,but they feel good after car is warm and no dusting.I have used OEM and semi metallic,got tired of noise from both of them.Carbon and ceramic are noiseless,although I think I have some groan from ceramic when slowly coming to stop[but might be something else,i have been to busy to check it out]but no annoying sqeauk or squeal