The person who decided to use 60/90 grit as the first step in rock tumbling was a genius. We found that extra coarse grit can be LESS effective than 60/90.
Extra Coarse Rock Tumbler Grit - What You Need to Know
How to Tumble and Polish Stream- or Beach-Rounded Rough
Rock Tumbling 101: Beginner's Guide to Polish Rocks - AB Crafty
NATIONAL GEOGRAPHIC Rock Tumbling Media
NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit - 1 Lb. Madagascar Rough Rocks for Tumbling, Rock Tumbler Grit and Jewelry Accessories, For All Ages
Rock Tumbler Grit and Silicon Carbide Grit Kits
6 LBS Large Weight 4 Step Rock Tumbler Grit Set
1.Superior Quality Abrasives: Our 10 lbs Super Large Combination Package is made of high-quality silicon carbide abrasives that ensure effective
10 LBS Large Weight 4 Step Rock Tumbler Grit Kit, Tumbling Media Refill - Coarse/Medium/Pre-Polished/Final Polish Grit Works with Any Rock Tumbler
Rock Tumbling 101: Beginner's Guide to Polish Rocks - AB Crafty
Tumblin' tumblin' tumblin', keep them rocks a tumblin'. The #300 4-Step Grit Pack is available for when your grit has run low, and includes 4oz. coarse, 4oz fine, 2oz. prepolish and 2oz polish grits.
Grit Pack for #115
How to Polish Rocks with a Rock Tumbler - The Crafty Blog Stalker
NATIONAL GEOGRAPHIC Professional Rock Tumbler Kit– Extra Large Barrel
Rock Polishing Kit, Rock Polishing Grit