StopTech Sport Rotors are also available with an optional cryogenic treatment. Although cryogenic treatment is invisible to the naked eye, many fleet customers are sold on its ability to extend the service life of the brake rotor. Deep cryogenic treatment is a one-time process that permanently improves the performance and wear characteristics of metal components, from brake rotors and engine parts to machine tools and gear sets. All new StopTech Sport Rotors may be ordered with cryogenic treatment for an additional fee. Symmetric vane, split-core castings for uniform heat distribution. Black E-Coat anti-corrosive coating protects much better than competitors spray paint. Double disc ground friction surface for optimal performance and service life This extra process provides better rotor balance and creates a cleaner; more finished looking component; In addition; Rotors are inspected for balance and mill-corrected to a tolerance of less than 2oz 2005 - 2010 Volkswagen Bora, 2005 - 2018 Volkswagen Jetta, 2006 - 2009 Volkswagen Rabbit, 2006 - 2012 Seat Leon, 2006 - 2014 Seat Altea, 2006 - 2014 Seat Toledo, 2010 - 2014 Seat Freetrack, 2010 - 2018 Audi A3, 2010 - 2018 Volkswagen Golf, 2012 - 2017 Volkswagen Beetle, 2014 - 2016 Volkswagen Caddy, 2014 - 2016 Volkswagen Gol Sedan, 2015 - 2018 Audi A3 Quattro, 2015 - 2018 Volkswagen e-Golf, 2015 - 2018 Volkswagen Golf SportWagen, 2016 - 2016 Volkswagen Eos, 2017 - 2018 Volkswagen Golf Alltrack