J&L 1"-One Inch Threadless External Ceramic Headset-Seal Bearing-25.4*30.0/30.2

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Accept return/exchange within 2 weeks if you save the item in original condition
1 years of warranty for proper usage only
Description
Bearing Cup size： 30.0MM(JIS) or 30.2MM(ISO)
Crown Race Inside Diameter: 27mm for Both Type
Made of
6061
-T6 Aluminum
Alloy,
CNC Machined and Polished&Anodized surface
Threadless& External
Frame headtube internal diameter Need to be: 30.0MM or 30.2MM
2 Sealed Cartridge Bearings
Weight: 94g
Stack Height: 27MM
Regular Bearing
：
Race Material: P6 bearing steel
Enclosure: Two Seals
Enclosure Material: Rubber Seal
OR
Hybrid Ceramic bearing
：
Race Material: P6 bearing steel
Ball Material:
Nitrided Silicon Ceramic SI3N4
Enclosure: Two Seals
Enclosure Material: Rubber Seal