Nordic Step Universal Shoe Harness for Cross Country Skis: LIGHTLY USED RETURNS Model 3Pin Used and Rock Skis The fine steel is more PowerGrip Green is used The fine steel is more effective than the fine brass making it a great choice for race skis Comes as a single wheel or you can get these wheels as a full set four pack (2 x ratcheted wheels & 2 x non ratcheted wheels) for 10% off if you need to replace all four wheels It combines modern snowshoe binding technology with a cross country ski boot sole to allow any size or shape of winter footwear to be used as a 'ski boot * Reuse your beloved hiking boots or winter snow boots on your skis