RSL 1 is a low-metallic, resin-bonded material with steel and aramid fibers and very high heat resistance. It is set up to keep friction steady over a very broad temperature span while remaining wear-conscious, which explains its popularity in endurance formats. It is used in GT, touring car and prototype endurance racing and also in sprint racing when more friction and strong modulation are desired. Together with its mix of High friction coefficient, Long pad and disc life, Good friction stability versus temperature, and RSL 1E offers even longer life, this gives RSL 1 a confident, usable character. Overall, it stands out as a strong choice for drivers and teams looking for a pad that balances performance, control, and consistency in demanding motorsport conditions.