Introducing the world`s first tapered and welded, alloy 31.8mm clamp BMX handlebar Box One Alloy Triple Taper Handlebars are stiffer than our carbon fiber bars and nearly as stiff as our One chromoly handlebars, making them an ideal choice for up-and-coming BMX racers They fit all Box and Promax 31.8mm stems, as well as those from other suppliers 31.8mm 27` 7` 2? 7? Black Polished BMX AlloyUPC/EAN/GTIN: 616043825236