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[Premium Metal Construction] Durable and reliable for long-term use. [Optimal Bearing Sizes] Upper bearing: 30.15x41x6.5mm, Lower bearing: 40x51.8x8mm, with 36°/45° chamfer. [Compatibility Assurance] Compatible with FSA Orbit 1.5 ZS Headset No.57, compatible with FSA Headset No.57CF, compatible with FSA Orbit 1.5 ZS Headset No.57-1. [Effective Seal Design] Sealed rubber rings prevent water and dust ingress. [Universal Application] Suitable for mountain, road, and downhill bikes.