192042 pair Ski Doo 5.7 & 6.9 ski EverLaster Carbide Blade-Z.  This ski has a center keel.  This kit is 1 pair only for some riders just put carbides on the center keel only.  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.