Compatible with every Dynafit binding.  For extra traction in firm snow and icy conditions.  Quick and easy to take on and off.  A must have for all backcountry ski mountaineers. Make sure that you buy the size that is slightly larger than the width of your ski where the ski crampon attaches just behind the binding toepiece.  If the ski crampons are 10mm to 15mm wider than the waist of your ski, then they will still work just fine in most all conditions. Don't stress about it, get some ski crampons. Save yourself a lot of energy and effort on the way up.

120mm size is 115g

110mm size is 105g

100mm size is 102g