Specially formulated and easy to use design for the National Geographic Rock Tumbler. You get one full set, four bags of rock tumbling grit and polish. Each kit contains Grade A tumbling grit and polish as used by gemstone industry professionals, to tumble rocks in your National Geographic rock tumbler and bring them to a gem like finish.

The tumbling process for rocks uses a four step process and these abrasive and polishing materials.
Each kit contains the following four items.

One 2 oz. package coarse Silicon Carbide (60/90 grit) used in Step 1
One 2 oz package medium Silicon Carbide (120/220 grit) used in Step 2
One 1.5 oz package pre-polish Aluminum Oxide (500 grit) used in Step 3
One 1.5 oz package polish Aluminum Oxide (Fine, micron sized) used in Step 4

Remember, each of the above items is pre-measured for you convenience, making it easy to get the measurements right.

The abrasive media is shipped in separate plastic resealable bags.

This product is made in the USA and is of the highest quality used in industry.