The ION Crampon can be mounted independently from the binding, making it an excellent after market crampon for any tech binding / ski for some but not all bindings. The Ion crampon is reverse compatible with the G3 ONYX binding and includes the necessary hardware Size 85 mm, 95mm, 105 mm, 115mm, 130 mm (recommended fit based on ski waist) Weight (single) 137 g / 4.8 oz MATERIAL Embossed 7075-T6 aluminum