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Painted & Drilled & Slotted Brake disc
As brake rotors are made of iron, they naturally rust and when exposed to minerals such as salt, the rusting (oxidization) tends to speed up. This leaves you with a very ugly looking rotor.
Naturally, companies started looking at ways to mitigate rusting of the rotors. One way was to get brake disc pained to prevent rust.
Also for higher performance, please will like the drilled and slotted style rotors.