Smooth Black Pebbles 4 Pounds All Natural Stone, Aquarium Terrarium Garden Rock Bonsai Home Decor Crafts Smooth Black Pebbles ~ 4 Pounds in a Netted Bag. Organic, Natural Stone! No Plastic! No Resin! Extremely beautiful in an underwater setting where Colors darken and become more enhanced. Safe and decorative in reptile terrarium settings Also great in vases or around your potted plants or in Bonsai Arrangements!