For 1" threadless steerer- 6061/T6 CNC machined top cover with seals- 6061/T6 forged and cne machined cups- 7075/T6 CNC machined crown race- Angular contact sealed bearings- Size: 1" Threadless Headset- Dimension: 1"x30x26.4- ACB Sealed- Bearing: NHB-6B (OD 41.8×45×45)- Stack Height: 17+12=29mm 1mm- For 1"steerer fork - For head tube ID: 30mm- ISO 26.4mm crown race- Weight: 121g (include Alloy top cap) - Color: Black (as pic. shown)- Made in TAIWANContent: 1 set (With top cap and starnut) / pack