TRU-BLU is or special heat treated, Closed Coat, Aluminum Oxide on an X-Weight Cloth backing. Originally designed for the aeronautical industry, it has woodworking advantages. Mainly with use on plywood and MDF (Medium Density Fiberboard) these discs will close off the porousness of these materials, making finishing easier. X-Weight cloth means that its flexible in one direction to be used for hand sanding. We sell Tru-Blu in 10 packs of discs
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