Aquael Dolomite Gravel 2-4mm 2kg is a natural, lightweight, and decorative aquarium gravel. This gravel is composed of crushed dolomite, a sedimentary rock that is popular for aquariums due to its neutral pH and calcium and magnesium content. The gravel has a particle size of 2-4mm and is a light tan color with hints of grey and white. This gravel is ideal for freshwater aquariums, terrariums, and other decorative applications. It can be used as a substrate for aquatic plants and provides a natural look to any aquarium.