... 2. Size: 1-3mm, 3-5mm, 5-8mm, etc. 3. Color: white, black, yellow,red, grey Small round white cobble stone Characteristics of pebble ... cobble stone:1. Variety: various cobble stone, pebble stone, etc.2. Specification :2-4cm; 3 ... -5cm; 4-6cm, etc. 3. Color: color mixing, red, black, yellow, white, gray, etc. 4. Usage: ...