Constructed from lightweight steel and plastic with a stable 56.5mm width, the NNN BC Manual Cross Country Ski Bindings are designed to provide optimal control and user-friendly functionality. 466 g. steel and plastic construction. 56.5mm wide stable platform. Secure locking front closure with larger grip for ease of use. Compatible with NNN BC boot soles. Skis and bindings are shipped unmounted and unadjusted. Skis, boots and bindings (including track mounted bindings) must be installed, adjusted and tested as a complete system by a qualified ski technician prior to use. Please contact our Customer Service Department at 888.463.6367 for help locating one of our stores that can perform the mounting service.