The Aqua One Natural Gravel is an Australian sourced natural gravel with no added colours. The aquarium safe, inert gravel will not affect pH levels, whilst providing a natural environment for your aquarium inhabitants. Features & Benefits: Sourced and packaged within Australia Aquarium safe inert gravel that does not dynamically change pH Promotes healthy bacteria growth Assists in stimulating a positive natural environment for aquatic life Creates depth allowing plants to create a substantial root system Accentuates your aquascape for an aesthetically pleasing display Easy to set up and maintain Available in a variety styles Specifications: 8-12mm per piece 10kg