40-Series ZS Set Short Carbon 40-Series Represents the Perfect Balance of Performance, Durability and Value UD Carbon Cover and Internally Contoured 6061-T6 Aluminum Cups Innovative Clip-Seal Seals the Top Assembly and Captures the Compression Ring Interlok Spacer Compatible Sealed Black Oxide Steel Cartridge Bearing Consistent Stack Heights Across 10, 40 and 110-Series Internal Parts Are Cross-Compatible Across 10, 40 and 110-SeriesItem SpecificationsColor: UD CarbonSize: 1-1/8"UPC: 840226094885MPN: BAA0075UDSold Individually