Alpha Diamond Hand Polishing Pad - 150 Grit Sanding Disc for Stone, Granite & Marble - Perfect for Countertop, Tile & Concrete Surface Restoration

These work wonderfully well for smoothing the bottoms on my handmade high-fired pottery. I used to use wet strength sandpaper, but this is easier to use and lasts a very long time. I liked it so well I purchased three more as back-ups, but haven't needed them; the first one still works just fine.