Rock and or glass polishing kit together with instructions and information on rock tumbling with pre-polish aluminum oxide powder and cerium oxide polishing powder.Each bag will contain approximately 1/2 pound ,enough for 6 pounds of rock tumbling in either a rotary or vibratory type polisher/tumbler.After the 3rd stage most rocks will be ready for the pre-polish stage and some even the polish stage.Most rocks will require 5 or 6 stages to attain a great polish,,the 3 prep stages to prepare the rocks for polish,a pre-polish stage to make ready for a fine polish,a polish stage to get that great polish shine and finally a cleaning stage.This grit kit can also be used on a flat lap for polishing as well.