The FSA Intellaset Headset. Columbus style integrated look headset for 40mm ID 45mm OD headtube. Alloy cups for long life and patented alignment tip for increased durability and performance. TH brand 36 degree micro angular contact bearings (red seal). 7075-T6 alloy crown race and aluminium top cap. Stack height: 15.5+12.2=27.7. Weight 111grams. 1 1/8 inch.