Material: Our expanded clay pebbles are , , porous and lightweight. They are baked at high temperature, no chalking in water. Therefore, leca is a good growth medium for hydroponic and soilless . These clay pebbles are a -have for control and happy roots Specification: These 4LBS of expanded clay pebbles, they're all very different sizes. The diameter is about 4-16mm, which works very well for getting in different nooks and crannies between roots. It is suitable for : Clay Pebbles can offer excellent aeration, hold water, and free-draining, which provide good content around the root and make it more to grow. It will save your from the moss that chokes their root system Decoration: Organically expanded clay pebbles help thrive and decorate your 's pot. The brown color and round shape make it more cute and neat, for decorating . It also can be as the substance of bioactive tanks for your reptiles and amphibians for: Expanded clay particles are mainly for hydroponic orchids, soilless cultivation, and horticultural aquariums. During the hydroponic process, they leave brown sludge in the water. It can be cleaned after a few rinses