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 1998 - 2004 Audi A3, 1998 - 2006 Volkswagen Golf, 1998 - 2011 Volkswagen Beetle, 1998 - 2015 Volkswagen Jetta, 2000 - 2006 Audi TT, 2001 - 2005 Seat Leon, 2001 - 2005 Seat Toledo, 2001 - 2009 Seat Cordoba, 2002 - 2012 Seat Ibiza, 2003 - 2017 Volkswagen Polo, 2007 - 2010 Volkswagen Golf City, 2008 - 2009 Volkswagen Jetta City, 2010 - 2011 Volkswagen Beetle Cabrio, 2011 - 2015 Volkswagen Clasico, 2011 - 2016 Audi A1