High quality metal/rubber shielded bearings enhance performance and durability. Kits include all bearings such as standard, flanged, one-way, and thrust if needed. Extra bearings are included for spares or on-demand replacement needs. The kits come packaged in a re-usable storage container for your spare parts. Metal shielded bearings feature removable shields for cleaning and re-oiling, while rubber shielded bearings offer the best defense from dirt and grime. Metal shielded bearings have less rotating friction than rubber shielded bearings. Rubber shielded bearings are packed in grease, requiring a short break-in time for peak performance.