Origine's tapered Inset 1''1/8-1.5'' headset has been specifically designed for cyclists seeking precision steering and performance. -Top cap machined from a single alloy block with an O-ring and gasket for a maximum protection and seal. -Sealed premium quality bearings for friction-free smooth operation. Requires little turning effort, friction-free. Assembled in a controlled environment. It's the small details that count. Compatible with all the following frames: Tuxedo / Tuxedo Evo / Tuxedo Evo II / Axxome I 250 / Axxome I 250 Evo / Axxome I 350 / Axxome I RS / Axxome I RS2