Made of natural ceramic, uniform surface, no other chemical ingredients added?especially great for tropical fishes, shrimp. Applied for Discus, Angels, Clownfish and other substrate fish to spawn. Made of natural ceramic, high quality, can process water filtration in your aquarium. Ceramic cone with smooth surface is good for fish egg to attach on it easily, ensure high reproduction by your fish. Provide spawning sites for your fish, also as ornament to decorate your aquarium fish tank.