Biyork Floors Hydrogen 6 Rock Cliffs is a spc - click plank vinyl flooring with a 6mm thickness and a 20mil wear layer for lasting durability. Plank dimensions are 7" wide by 60" long. It includes built-in underlayment for added comfort and sound control. Each box covers about 23.25 square feet. This product is FloorScore certified, ensuring safety and quality for your space. Category: Vinyl. Brand: Biyork Floors. SKU: BYKHY6HP50RC.