NEW ABEC-7 Stainless Steel Ball Bearing Replacement and Upgrades for Shimano FIREBLOOD. Bearing Replacement - Replaces all factory ball bearings. Bearing Upgrade - Replaces all factory bushings with actual ball bearings. Complete Bearing Kit - Replaces all factory bearings plus bushings with ball bearings. Please feel free to contact us if you would like to know exactly what's included on any particular kit.