Crank Brothers Sage Headsets. Upper and lower bearings are sealed 34-ball cartridgesFreeride headsetSL Models are stainless steelSL Models are stainless steel, C models are bearing steelC models are bearing steelAll models include installation ring, no extra tools needed to press cups into frame.Item SpecificationsColorSilver/GreenWeight92gMaterialStainless SteelSteerer Tube1-1/8" ThreadlessCrown Race30.0Stack Height21mmBearing TypeCartridge Headset Type1-1/8" Standard Cups