1. Full ceramic pulley design for enhanced durability, lighter weight, and silent operation 2. Anodized surface treatment provides superior impact resistance and prevents rust and oxidation 3. Full ceramic bearing design enables self-lubrication, maintenance-free operation, and reduced noise 4. Deep-tooth pulley design improves chain engagement, minimizes rough gear feel, and significantly reduces noise 5. Tooth count: 18T 6. Material: aluminum alloy, ceramic 7. Compatibility: universal fit for Shimano 9-speed, 10-speed, 11-speed systems; compatible with Blueprint ERX/ER9/R9/R7; compatible with Majin QED (Note: not compatible with LG long-leg derailleurs. May not fit certain derailleurs with specific mounting positions. Users must verify compatibility with their rear derailleur before purchase) 8. Weight: about 28g 9. Size: about 7.3cm
