What material is flower ceramsite made of?

Flower ceramsite is made by processing high-quality pottery clay and other materials into balls, then firing them at high temperatures. Using flower ceramsite as a horticultural growing substrate not only has advantages such as not breeding mosquitoes and flies, being clean and hygienic, beautifying the environment, and being green and eco-friendly, but it can also enable soilless cultivation of plants such as flowers, vegetables, and trees.