Black Diamond 01 / 02 / 03 Cartridges - Optimize your binding stiffness with your skiing style by selecting FreeFlex for light resistance and a softer flex, MidStiff for stiffer boots and aggressive skiers and Ridiculously Stiff for the ultimate downhill performance. This is a pair of Ridiculously stiff and then will whip your skis around with no troubles at all. Looking to push a bigger ski or some stiffer groomer ski...well look no futher! Also good if you need a back-up pair of cartridges on a B.C. trip.