Magnesium layers above and beneath the poplar and ash core give Blizzard' s FIS-certified World Cup race skis their power. This year, Blizzard added an oil piston to the SL designed to reduce vibration and prepare the ski to engage earlier in the new turn. Also new this year: A Blizzard/Marker power plate which, in addition to dampening vibration (it' s connected to the piston), adds stiffness. The plate fits Marker bindings only. Other specs are what you' d expect from a race ski: classic sandwich construction with phenol sidewalls. Sold flat.