"FRANKE" GRAPHITE GRANITE DOUBLE KITCHEN SINK * 33" x 22" x 9" * Double bowl * Onyx color * Quartz crystals are bonded with acrylic resin to create Franke USA"s amazing rock hard surface * Won"t chip, scratch, stain or scorch * Franke USA granite sinks provide you with unmatched durability with a wide variety of colors and styles