Fundamental Rockhound Products: Premium 4 Step Rock Tumbling GRIT KIT for 3 pound tumbler Single Use Refill Single use kit for a 3 pound tumbler barrel. Pre-measured packets are enough to tumble 3 pounds of rock. 4 oz Coarse 60/90 grit, 4 oz Medium 150/220 grit, 4 oz Fine 500 grit 2 oz Micro Alumina tumble polish, grit saver, excellent instructions / tip sheet Perfect for beginner Rockhounds. this is an American Made product