Bicycle Headset Expansion 3K T800 Carbon Fiber Headset Stem Top Cap MTB Stem Fork Top Cover for 1-1/8" Fork Cycling PartsThis compreor is ideal for carbon steerers. T800 Carbon fiber Top cap and Aluminum alloy Expanderprovide better strength and greater rigidity.Top aembly for carbon steerers which reps ditional top cap and star nut aemblies.