Full Speed Ahead FSA Impact PC Integrated BMX Bicycle Headset Unique translucent polycarbonate top cover 1-1/8in, 45 degrees/ 45 degrees ACB Gyro Compatible, For 44mm OD Headtube 1-1/8in steerer, Weight: 58g, Stack Height 8.3+0.5=8.8mm Polycarbonate top cap, Campy Angular Contact Bearings (black seal)