Headset Specialized BearingMultiple specificationsFlexible rotationQuiet and silentAirtight waterproofMore sizes, more choices!Here are the usual ones!Product SizeNote: 41mm ≠ 41.8mm can not be mixed, please pay attention to the distinction!Multiple specificationsNote: There is tolerance in manual measurement, please refer to the actual product.Product IntroductionSteel sealed bearingData, clearly visibleMaintenance freeFlexible rotationQuiet and silentEasy to adapt to the harsh riding environment!Steel ball cage sealing systemSelected high-quality steel, the ball is strong, smoother, and can't change under high pressure.It is internally filled with high-viscosity grease, with sealing ring, rust-proof and maintenance-free!Bearing steel ballDo our best to make products!Sealed waterproof, rust-proof, maintenance-free!Sealed rubber ring bearing, more durable! RISK Do our best to make products!Quiet and Silent Quality GuaranteeSize, clear and visible(Model/Outer Diameter/Height/Angle)Fine work, smooth surface!