The K1 series is optimal for off-road riding on dirt bikes and ATVs. It's recommended for riders who demand great off-road braking power. While the K1 series can be used at a competitive level on the rear brakes, GOLDfren also has other options more suitable for world-class racing such as S33. The K1 compound provides low abrasive interaction with the brake rotor, long life and self-cleaning capabilities. Friction materials contain metal-ceramic with a sophisticated bronze-graphite and full-metal mixture formulation with fine friction particles to achieve optimal friction properties.