Compcor Raven SlateHPL product manufactured with high tech polymers which provide extreme durability for both interior & exterior use. Features a core comprised of thin layers of kraft paper saturated with phenolic resin then pressed under high temperature & pressure. It is then cut to size, inspected & coated with a protective film. Finished color of core is black. 12mm thickness. Option of 2 umbrella hole with grommet on some sizes. NEW & IMPROVED base mounting