K2 AMP STRIKE w/ Marker Fastrak 10 Bindings. Marker Fastrak 10 Bindings Are Fully Adjustable from. 272 mm – 372 mm. K2’s Amp Strike skis are the perfect solution for beginner and intermediate skiers seeking an affordable and durable pair of skis to help them progress. The catch free rocker allows for smooth, effortless turns and prevents catching edges at any speed. If you are looking for an inexpensive ski that does the trick for recreational skiing, look no further! This rocker profile is designed to aid developing skiers initiate smooth turns even at low speeds. A slightly elevated tip and tail allow skiers to carve at lower speeds without worrying about catching edges. This added confidence makes skiing more fun and helps skiers develop faster. Torsion Box construction is the foundation for a wide range of skis designed by K2. Depending on the dimensions of the ski, and the amount of flex and torsion designed into it, one model of a Torsion Box ski can differ greatly from another. The versatility of the construction enables K2 to build everything from entry-level through expert skis with this method. Torsion Box skis share common traits of ease, forgiveness, responsiveness, and energy.