Easton Havoc Seatpost 350mm Aluminum: The Easton Havoc Seatpost is cold-forged from 7050 aluminum alloy for reliability under the intense stress of freeride and downhill mountain biking. The burly Havoc receives a shot-peened finish to further prep it for abuse, and the polished head clamp can accommodate 7mm and 8mm saddle rails, yet this fully freeride-aimed seat post weighs in at a modest 285 grams