Premium J-weight Aluminum Oxide 9 x 11 sheets in 3 grit sizes – 80, 100 and 120. These are stiffer and more durable than paper-backed sheets and lay flat on a sanding jig for excellent cutting and long life. These sheets can be used up to 4 times, minimizing your cost.

For each sanding session, use each sheet only time and a different sheet per rock.  After sanding is complete, you can keep the sanding sheets and save them for the next time you need to sand, again using each sheet once and a different sheet per rock.  The grit should hold up long enough to use four times.