Odyssey Pro Integrated Headset material: 6061-T6 Aluminium | CNC machined dust cover type: integrated | Campy spec 45/45 degree fork size: 1 1/8 inch threadless bearings: high-quality sealed bearings color: polished additional information: low stack height 45º tapered bearings 41.8mm outer diameter (fits 42mm bmx head tubes). designed with the lowest possible stack height, using high-quality sealed bearings and a precision tapered wedge to keep the headset tight at all times