This is a Giant OverDrive Tapered MTB Headset 1-1/8" to 1-1/2". Features: Fits all Giant Mountain Bikes with Tapered headtubes 1-1/8" to 1-1/2" diameter Internal bearing headset for tapered 1-1/8" to 1-1/2" steerer tubes Forged and CNC machined alloy cups Angular contact bearings Alloy top cap Compatible with 2010+ Giant mountain frames with tapered headtubes Specifications: Size: 1-1/8" to 1-1/2" (Tapered) Type: Threadless (Zero Stack) Color: Black Weight: 135g