... pebble stone, river pebble, natural pebble, and machine pebble Pebbles: Pebble, pebble stone, river pebble, natural pebble, and machine pebble and so on. Pebble & ... used for Massage stone. Excllent materials for footpath. And good decorative material for wall and floor. Features: 1) Dimensions: 3-5mm, ... . 2) Colors: White, black, red, gray, yellow, multicolour and so on. Your inquiry always welcome!