Description The Veloci Rollcii EC34 Headset is a sealed bearing 1 1/8″ threadless headset that suits so many bikes! The ROLLCii headset is built to last with top-quality sealed ball bearings, ensuring durability on the road. Crafted from lightweight machined aluminum alloy parts, it stands up to anything you throw at it. Veloci Rollcii EC34 Headset Specs Cups & Covers Material: 6061 T6 Aluminium Crown Race Material: 7075 T6 Aluminium Top Stack Height: 17mm Bottom Head Tube ID: 34mm Crown Race Diameter: 30mm Bearings: Sealed Bearing (OD 41.8 x 45° x 45°) Top Head Tube ID: 34mm Stem Clamp Diameter: 28.6mm Down Stack Height: 12mm Weight: 95g Finish: Wet Black, Polished Silver, Rich Red or Lavender Purple