Dynafit - ST Rotation 14 90mm magnet - Strong downhill performance with safety and comfort. The ST Rotation 14 binding was developed for descent-oriented ski tourers who seek strong downhill performance, safety and comfort. The binding is impressive as a nearly indestructible partner with durable construction for your perfect line. The patented Dynafit pivoting toe piece evens out impacts that can effect ski and binding on a powerful dynamic downhill.