Headset for Scott Genius MY18 Carbon including plastic topcap with L-shape 1'1/8"-1'1/2 Tapered, Press Fit, ZS44/28.6 | ZS56/40, Alloy, sealed cartridgeBEARINGS: Sealed cartridge bearingsUPPER FIT: ZS44/28.6LOWER FIT: ZS56/40