The CousDUoBe 13 Pcs Artificial Aquatic Plants Small Aquarium Plants, Plastic Fish Tank Decoration Home Dcor Fish Tank, Size 4.5 inch is made of environment friendly PVC materials with ceramic bases that are metal-free and will not affect the water quality. The leaves are soft and do not scratch the fins, the plants sway with the waves and can be place in both fresh and sea water. The sturdy ceramic base prevents plants from floating in your aquarium. It is recommended to bury the base in sand for a better look.