7075 T-6 aluminum cupsCompatible with tapered 1-1/8` to 1-1/2` steerer tubes, or straight 1-1/8` steerers with a conversion crown race (sold separately)Aluminum dual seal crown race protects lower bearingCarbon-friendy compression ring captured in top coverStainless bearings feature Split-Lip seals for twice the protection of a typical cartridge bearing ZS44/28.6|ZS56/40Black28.6444012-1-1/8 to 1.5`UPC/EAN/GTIN: 840226077765