Description of Volkl Unlimited AC40 Carbon Skis w/ iPT 12.0 Bindings For good skiers who want to ski every possible condition the mountain can dish out, the AC4 comes back with a beautiful graphic update, and a layer of carbon added for additional liveliness. With Extended Sensorwood core, Extended Double Grip, and the Motion iPT system, the AC40 Carbon is quite probably the best-performing mid-fat system available in the market today. Features: Lengths (Radii) - 163 (14.4)_170 (16.1)_177 (17.8) _184 (19.5) Construction Motion System Extended Double Grip Core - Extended Sensorwood Titanium - 2 sheets Sidecut: 125_82_110