Titanium Ti HeadsetUltraLight Titanium Ti Headset 11/8" 145g/TiMade of Ultra light Ti3Al2.5V Titanium,normally for Aerospace Industry usage CNC Machined and Polished surfaceHeadtube size: 11/8"Fits road and MTB bikes.Approximately 145g total weight including stem cap, steel bolt, and star nut.E-mail:tibicycle@126.comwww.tibicycleparts.com