Fundamental Rockhound Products: 5 Step Rock Tumbling GRIT KIT for tumble polishing rocks Enough to polish up to 50 pounds of rock! Grit kit with enough to tumble up to 50 pounds of rock. You will receive Extra Coarse, Coarse, Medium, and Fine silicon carbide grit, grit saver, and tumble polish Instructions are included This is an excellent package when you have really rough stones.