White machine-made pebble and River pebbles. Various colors pebbles. Good price and good service. Machine-made pebble and River pebbles.------------------------------------------------------------Material:Natural stone, granite, marble.------------------------------------------------------------Size: 1-2cm, 2-4mm,4-6mm,5-8mm,8-12mm, 12-16mm, 16-20mm, 20-25mm,25-32mm....etc ...