The 2011 Fischer RC4 17 Freeflex binding is designed for ski racing. The Freeflex has a DIN from 6 to 17 is strong and made to go on Fischer RC4 World Cup Hole Skis. The Fischer RC4 Freeflex Z17 Ski binding has a full diagonal toe and heels, rollers in the toe and a rotating AFD to provide one of the safest race bindings you can buy. It helps smooth out the flex of the Fischer RC 4 Race skis.