Upgrade your terrarium swagger with the Exotic Pebbles Polished Black Gravel. This natural polished black gravel is 100% sourced from nature. Gathered from different quarries from around the world， each piece is uniquely shaped so you can achieve a naturalistic look easily and with less effort， anywhere you use them. They also come in various sizes to accommodate your needs! Polished gravel has a paraffin wax coating， creating a shiny or wet look in dry environments. It is great for terrariums or reptile enclosures and can be used as soil topper， or for decorative purposes and crafts. For aquarium use， Exotic Pebbles non-polished gravels and bean-size aggregates are recommended.