2 , 15 lbs Natural pebbles for fish Aquariums. All stones are graded to approx a fine 1/8 to 1/4 inch size pebbles Not sand fine pebble stone. All stones are basically the same size. Will not clog filters like sand can. Natural tiny river pebbles help Create a healthy fish environment. Helps promote good bacteria to maintain good water quality. Tiny pebbles have random colors and shapes. Stones are shown dry in photo. Colors will deepen and become darker when wet.Your fish will feel comfortable with these natural river pebbles. Rocks will be Dusty from shipping and handleing must Pre Rinse stone untill water is clear BEFORE applying to your tank bottom.