On bikes with integrated headsets (such as the Ritchey Road Logic and Swiss Cross), the WCS IS's integrated headset features all-stainless bearings that are infused with Ritchey's high-fibre lubricant. Material: alloy Stack Height: 9.1, 16.0mm Headtube ID: 41.0, 42.0mm S.H.I.S.: IS41/28.6 (1 ⅛"), IS42/28.6 (1 ⅛") IS41/28.6 (1 ⅛") bearing: 41.0/30.15/7mm 45°/45° - sealed cartridge (ACB) - titanium coated IS42/28.6 (1 ⅛") bearing: 41.8/30.5/8mm 45°/45° - sealed cartridge (ACB) - titanium coated Weight: 36g Color: black