Smaller than a boulder and larger than pebbles, flagstone cobbles are square and/or rectangular hand dressed pieces of sandstone and limestone in higher thickness are used as second best choice after granite cobbles. These cobblestones are usually hand dressed so that they are tapered from top to bottom. These natural finished flagstone cobbles are cheaper and widely used as paving stone for sidewalks, driveways, patios, pavements, etc. They require little maintenance.