TheFSA Impact BMX Gyro Compatible Headsetis a must have for all bmxers who have a gyro set-up its sturdy build provides long lasting precise control enabling you to spin the bars over and over without worrying about any damage being caused! With a 9.4mm stack height the Headset sits relatively low on the front of the frame providing you with a comfortable ride that provides immense control at all times. As with all FSA headsets the Impact Gyro Headset is capable of taking a heavy beating and will still turn out a smooth run at all times. FSA Impact BMX Gyro Compatible Headset Features 1-1/8" 45 x 45 ACB Gyro Compatible For 44mm OD headtube 1-1/8" Steerer Campy Compatible bearings (yellow seal) 7075/T6 crown race Stack height: 9.4mm "