FSA Superlight M042R Alu Bearing Drop In Campy IS42 Headset

An easy weight-reducing upgrade for any bike. Featuring an aluminium housing for a low weight and steel races and balls for durability. Super Light ACB ball bearing for Drop In Campagnolo (45°x45°) headsets. Outer diameter 41.8 mm (IS42), inner diameter 1 1/8 inch. Included in delivery: 1 bearing Material: housing: aluminium, races/balls: chrome steel Weight supplement: per bearing, manufacturer information