Slick Rock Tiles™: Riverbed Concrete’s line of concrete tiles are made by hand by local artisans. Each is hand polished, bringing forth a unique character to every tile. There are 8 standard colors to choose from which exhibit a palette of warm, organic earth tones. Sizing standards include, 6”x6”, 4”x12”, and 20”x20”. Manufactured utilizing 30% post consumer recycled material, Slick Rock Tiles™ are manufactured with our environment in mind.