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All PSA discs have paper backs except 12" which are cloth backing The grit available are: 60,80,100,120,150, 180 & 220 All discs are made of our Premium aluminum oxide abrasive....and is good for wood, metal, plastic & fibreglass. Tips & Hints - To remove PSA discs, heat disc & pad with blow dryer and peel off once the glue has softened.
When storing PSA discs, keep them flat, with a weight on top if necessary. Humidity and temperature may cause the discs to bow. In this condition, it is very difficult to apply the curved disc to a flat surface.