FSA Impact Pro Internal Headset Full Speed Ahead with the FSA Impact Pro Internal Headset. For use in BMX frames and compatible with most detangler and gyro devices, the Impact pro is ready to hit the streets. Fully serviceable and sealed cartridge angular contact bearings keep the bars spinning and the turns burnin'. Features : Campagnolo compatible Gyro Compatible Bearing Type: Cartridge Alloy top cover Patented alignment tip for increased durability and performance 7075 alloy crown race Laser etched aluminum top cap 45/45 degree angular contact bearings Specification : Headset Type: Internal Crown Race: 30mm S.H.I.S Lower: IS42 S.H.I.S Upper: IS42 S.H.I.S. Stem Clamp Diameter: 28.6 Weight: 64 g | FSA Impact Pro Internal Headset Black, Internal, Campagnolo