Our handlebars are made of 7075-T6 aluminum, which gives an excellent combination of strength and flexibility. The 7075-T6 aluminum alloy is among the most durable and robust materials on the market. Probar handlebars have a larger diameter (28.6 mm) that tapers at the ends of the handle (22 mm). This means that the handlebar is strong and flexible even without a sleeper and at the same time compatible with the original knobs. If your handlebar is not a "Fatbar" model you need to purchase a 22 mm - 28.6 mm adapter. The left handle is equipped with grooves that allow a firmer fastening between the knobs and the handlebars. The handlebar is anodized to prevent corrosion. Laser-engraved position notches make it easy to assemble the handlebars.