Pebbles: Pebble, pebble stone, river pebble, natural pebble, and machine pebble Pebbles: Pebble, pebble stone, river pebble, natural pebble, and machine pebble and so on. Pebble & cobble stone can be used in the area of sideway ... used for Massage stone. Excllent materials for footpath. And good decorative material for wall and floor. Features: 1) Dimensions: 3-5mm, 5 ...