Primo integrated headset oil slickthe primo integrated headset has sealed 4545 campy spec cartridge bearings featuring a large aluminium top cap with 10mm stack height internal o ring for a tight fit and laser etched primo logos for a clean look features precision 4545 sealed integrated headset large aluminium top cap 10mm stack height internal 0 ring laser etched primo logos weight 62gbuyprimo componentsfrom chain reaction cycles the worlds largest online bike store