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The Rant Bang Ur Spanish BB includes 2 precision sealed cartridge bearings. 2 CNC machined 6061 aluminum cone spacers for a clean look, aluminum internal spacer, 4 steel crank arm spacers for dialing in your chain alignment. - Size: 19mm - Sealed cartridge bearings - 100% CNC 6061-T6 alloy cones - Include spacers for custom fit - Weight: 3.8 oz.