Greenland Cobalt is a 2.5" x 9" porcelain tile. Porcelain is pressed and fired denser than ceramic, which is what lets it take water, frost and daily traffic. A gloss glaze reflects light, which lifts a small or north-facing room. Porcelain of this density suits floors and walls through the home. The plank shape can run in a straight lay or a herringbone to draw the eye down a room. Order the area you are covering plus about ten percent for cuts and waste.