98-02 YAMAHA YZ250: EBC R Series Sintered Brake Pads (Rear) For the ultimate durability EBC presents its "R" series high-density sintered pads. A sintered copper material made in EBC's own U.S.A. facility, the "R" Series of heavy duty ATV and MX pads have become an aftermarket standard offering high durability and high resistance to contamination by mud, water, sand and grit, etc. offering reduced disc damage and long pad life. Many of us enjoy riding off-road with trying to be Malcolm Smith and getting the brakes red hot.