Nature's Ocean Pure Water Pebbles Premium Fresh Water Substrates is natural gravel with 100% acrylic coating. The pastel rainbow frost aquarium gravel will not alter the chemistry of the aquarium water. The non-toxic, colourfast pebbles are suitable for fresh & saltwater aquariums, ponds, and terrariums. Packaged in a 5 lb. bag.

Grain size: 8.7 - 9.5mm