Renthal Handlebar Twin Wall 997&nbsp;Blue Size 28.6&nbsp;mm Revolutionary double-tube Twinwall design makes fatigue failure virtually impossible. 1 1/8inch clamping area reduces slippage. Outer tube is 7010 T73 aluminum alloy for extreme resistance to mechanical damage. Inner tube is high-strength 7010 T6 aluminum alloy to resist prolonger wear. Both inner and outer tubes are anodized to protect against corrosion and wear. Multiple seals are used to prevent entry of water into handlebars. Clutch side of bars features a knurled texture to promote grip adhesion. Laser etched positioning grid helps you orient your bars. Crossbar adds rigidity while injection molded bar pad adds cushioning during an impact.