Made from a pure form of Novaculite, a natural abrasive, this three stone sharpening set includes a base and honing solution - everything you need to get started. Use the course stone to smooth out any burrs or nicks. The medium stone helps to begin polishing and removing rough edges. The fine stone sharpens the edge and puts a polish on the steel. The honing solution (included) makes the work fast and efficient. The best results are achieved using changing grades of abrasives, and this set is the perfect combination to help you get the results you need.