Our Nonpareil Blue Stoneis manufactured from a combination of #1000 to #3000 grit abrasives in a binder of natural clays. The Nonpareil Blue Stone will remove scratches left from stones between #800 to #2000 grit and will rapidly establish an initial polish. Many woodworkers will find this polish suitable for purposes where the keenest edge possible is not required. It is also suitable for touching-up an edge that does not require extensive work. Instructions are included. Size is 8-1/4˝ x 2-15/16˝ x 2˝.The sides and bottom should be painted with several coats of weather resistant lacquer or varnish.