Lortone Large 4-Step Kit Includes 5 lbs. each of coarse & fine abrasives, pre-polish & polish This 4-step quality grit kit contains coarse and fine silicon carbides, pre-polish compound and polish and instructions The lortone abrasive tumbling kit includes a complete 4-step set of pre-measured abrasives and polishes to finish 12-14 pounds of your own beautiful stones Step 1 is 60/90 grit silicon carbide to use for initial grinding and shaping of rough stone. Step 2 is 120/220 grit silicon carbide to use for smoothing stone surface after initial shaping Step 3 is aluminum oxide pre-polish for preparing stones for final polishing. Step 4 is ultra-fine aluminum oxide to use for final polishing on pre-polished stones