Hi-Tech Diamond sponge pads are to be used under our diamond smoothing discs, Tech-11 polishing pads and final polishing pads to provide a cushion that helps remove flat spots from cabochons. Simply peel the PSA backed sponge pad and apply to a clean backing plate. Then, apply your smoothing disc or polishing pad directly on top of the sponge pad.
6"- and 8"-diameter pads are available. All sponge pads are 1/8" thick and come with a PSA backing for easy application on backing plates.
Found it hard to get centered on the backing disk perfectly. Wish I could buy them pre-installed on individual polishing disks. Other than that I think they will only help polishing.