Margo 30lb. Decorative Pebbles River Rocks Colored Stones Medium Black Grade A Polished Pebbles 1 in. to 2 in. Easy to accent Grade A Black Polished Prevents erosion, helps soil retain moisture Pebbles size 1 in. to 2 in. Coverage area of 1.5 sq. ft. at 3 in. of depth; 2.3 sq. ft. at 2 in. of depth