This is auction is for a  Nordic Track Skier  replacement drive roller set. These rollers are from a machine which was not used often. These are from  psi skier. Thees are original Nordic TrackParts.  This will fit most wooden skiers. I can also add the four end rollers for $12. I have a simple instruction sheet which  I can include upon request.   I also have many quality parts available- just ask! Thanks for looking!