Product Description Technology:Endurance The plastic injected around the bearings in Endurance ball bearings protects them from penetrating moisture and dirt particles, so that regular maintenance is not necessary. Ceramic The ceramic hybrid ball bearings are particularly light and precise, and are especially suitable for time trial competitors and triathletes. Models:Type 1: Recommended Use:Rear HubBearings:standard ballCompatibility:Prince / ClimbHill (formerly Kong) / MAG 150 / MAG 170, with 17 mm axleManufacturer Number:BNZ0501 Type 2: Recommended Use:Front HubsBearings:standard ballCompatibility:Princess / KillHill (formerly King), with 17 mm axleManufacturer Number:BNZ0502 Type 3: Recommended Use:Rear HubBearings:standard ballCompatibility:Prince / Kong / MAG 150 / MAG 170, with 15 mm axleManufacturer Number:BNZ0503 Type 4: Recommended Use:Front HubsBearings:standard ballCompatibility:MIG 70, with 15 mm axleManufacturer Number:BNZ0504 Type 5: Recommended Use:Rear HubBearings:Endurance ball bearingsCompatibility:tune rear hubs with 17 mm axleManufacturer Number:BNZ0511 Type 6: Recommended Use:Front HubsBearings:Endurance ball bearingsCompatibility:tune front hubs with 17 mm axleManufacturer Number:BNZ0509 Type 7: Recommended Use:Rear HubBearings:ceramic ballCompatibility:tune rear hubs with 17 mm axleManufacturer Number:BNZ0512 Type 8: Recommended Use:Front HubsBearings:ceramic ballCompatibility:tune front hubs with 17 mm axleManufacturer Number:BNZ0510Contents:1 x tune bearing set Manufacturer: tune GmbH Im Mittelfeld 18 79426 Buggingen Germany info@tune.de