Box One carbon integrated headsets feature a custom CNC-machined alloy top cap in the shape of the Box logo with cut-outs to reduce weight. At the center of the top cap is an anodized aluminum bolt that threads into a gold anodized aluminum expander plug. This expander eliminates the need for a star nut and works with all 1-1/8″ steerer tubeseven carbon fiber ones. The top bearing cover is crafted from carbon fiber, which not only adds style but helps to shave weight. At the heart of the headset are two super-smooth, titanium-nitride coated, sealed, 4545 bearings. The titanium coating results in low friction, high corrosion resistance and smooth rolling bearings. A split crown race makes installation and removal from forks super easy. Box 1.5″ headsets are designed solely for tapered frames and forks, but also include an adapter which allows you to run a fork with a straight 1-1/8″ steerer tube.