Custom made from the highest quality 4130 chromoly, Box One™ Handlebars feature a proprietary 13-butted taper from 22.2 Ø at the grip area to 31.8 Ø across the lower bends. The added stiffness significantly improves bike handling while putting more upper body power into your pedal stroke. That means getting out of the gate and down the first straight faster and accelerating quicker out of the turns.