Step Steel ST-Edge 3mm Runner features precision that will make the difference. STEP® utilizes the finest steel alloys to make runners your skates (and game) can count on. From the very start of production, STEP monitors the raw materials to make sure their runners are up to their exacting standards. Major league players (NHL, AHL, KHL) speak highly of the performance the STEP runners give them, since the consistent manufacturing ensures a consistent performance whenever you change your runner.