Brand x headset 49iets sealedthe brand x 49iets headset has an internal zero stack 49mm upper cup and an external 49mm lower cup for use with a 1 18 15 tapered steerer it uses sealed angular contact bearings and has been designed to offer superior reliability quality and performance at an exceptional price point featuresangular contact sealed bearingsheight 203 1mmmaterial cnc forged and machined 6061 alloyshis norm zs49286 ec4939 8includes top cap and star nutbuy bran