Description This high quality polished dark grey river pebble stone is suitable for aquarium decoration. Its almost black/ dark grey color provides great contrast especially on the bright color gravel or beside any bright color hardscape. It is beautiful, weatherproof and doesn’t affect water quality. Stones Size : Mixed sizes of 3cm to 7cm Stone Color : Dark grey Appearance : Cleaned and fine polished flat pebble stone pH : Neutral Packaging : 500 g per net packing