Pebble is a rock fragment which is smaller than a cobble. They are rounded and/or elliptical in shape, having diameter between 10 & 150 mm. Due to erosion effect these rock fragments gets naturally tumbled with flowing river water from mountains towards planes, making its surface smooth.
Pebbles are available in wide varieties which include commercial grade pebbles,colored pebbles, polished and unpolished white pebbles and river pebbles.