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