Schwaben Zinc Coated Rotor Set
Audi B7 A4 3.2L 

From Schwaben come plain (no drilling or slotting) zinc coated rotors. These premium units are perfect for customers looking to get rotors with a coating, but without any slotting or drilling.

General definition & use of brake rotors or brake discs:

The brake rotor/disc is made of iron with highly machined surfaces where the brake pads contact it.  Just as the brake pads wear out over time, the rotor also undergoes some wear, usually in the form of ridges and groves where the brake pad rubs against it.  This wear pattern exactly matches the wear pattern of the pads as they seat themselves to the rotor. Only a small amount of material can be machined off of a rotor before it becomes unusable and must be replaced.  A minimum thickness measurement is stamped on every rotor and the technician doing the brake job will measure the rotor before and after machining it to make sure it doesn't go below the legal minimum.  If a rotor is cut below the minimum, it will not be able  to handle the high heat that brakes normally generate.  This will cause the brakes to "fade," greatly reducing their effectiveness to a point where you may not be able to stop!