EBC USR brake discs are the latest super quiet slot pattern for prestige and premium cars requiring discs that are almost totally silent featuring the latest chemically applied corrosion resistant black finish. This black coating has been tested with the industry standard salt spray test and proven to last anywhere between 2 and 5 years depending on conditions and represents the ultimate in disc rust prevention.Features; wide aperture grooves preventing dirt build up and aid cooling, black anti-corrosion coated castings offering EBC's best corrosion resistance ever, a quiet slot pattern and increased lifetime over standard parts.