192081 Ski Doo Pilot SL EverLaster Carbide Blade-Z.  This fits the Grand Touring skis with 2 runners up the middle of a single keel ski.  This kit comes as a 4 pack.  These 1/4" wide blades provide 5/8"-3/4" penetration (when new), with 6" of carbide.  With this added penetration there will be an improvement in traction/handling, so ski spring adjustment (or more) may be necessary to obtain best results.