Specification :

the pad with black coating a tough and resilient optional edge treatment applied to the air entering face of a pad. It has been formulated to withstand repeated cleaning without damaging the pad.
The black coating is nonporous and quick drying. It prevents algae and minerals from anchoring themselves into the substrate of the pad, so they fall off when dried. It also protects pads from the damaging effects of severe weather and long term exposure to UV light.
The coating extends the life of the pad over that of non-treated pads. It is the strongest, most weather resistant edge coating available and is the only edge coating with patented algae resistance.