Tested against the harshest environments, the unique material combination used in the QRS XD rollers offers improved impact resistance when shifting. This new recipe also provides higher resistance to wear and deformation, ensuring consistent roller diameter for long-lasting performance and prevents premature wear of critical QRS clutch components. High resistance to wear and shattering from aggressive shifting Unique formula prevents deformation for consistent performance. Precise roller tolerances which are critical to prevent roller seizure and premature wear to key components. Pack of 3.