Brand x headset 44 56iits sealedthe brand x 44 56iits headset has an internal zero stack 44mm upper cup and an internal zero stack 56mm lower cup for use with a 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 95 1mmmaterial cnc forged and machined 6061 alloyshis norm zs44286 zs5639 8includes top cap and star nut buy