Fsa xtreme pro ec34 lower headsetthis headset features a hard wearing forged and cnc machined aluminium construction, which makes it ideal for everything from clocking up the miles on your road bike to shredding the trails on your mountain bike. Fsa has also equipped this model with robust stainless steel bearings, so you can enjoy a durable, smooth action as you conquer every journey. Engineered for performance, this versatile headset weighs in at only 43.4g. This means that you'll also benefit from its incredible strength and smooth rotating performance, without worrying about adding any unnecessary weight to your ride.features cup material forged and cnc machined alloy bearing materialstainless steel use road, mtb fsa headset category premium fork steerer compatibility 1 1 8 forks lower 1 1 8, 36° 36° acb black seal higher quality seals laser etched graphic to easily identify the headset spec plus provides a higher quality look ec34 30 part number 121 0516 weight 43.4g approxbuy fsa components from chain reaction cycles, the world's largest online bike store.