High quality and biology neutral rocks designed to easy fragging. Our artificial rocks resemble natural live rock and unlike ceramic rocks, they are made of light materials and have high porosity. They are a perfect filtration medium and a perfect habitat for a number of beneficial microorganisms. With Aquaforest rocks aquascaping is easy, as they can be quickly cut, arranged and attached, and they are available in a variety of shapes.Diameter: 43 mmHeight: 20-22mm