Addicted2Fish premium surgical grade stainless steel Fine Tip Tweezers are designed to be used in both freshwater and marine aquariums.  These are ideal for planting and maintaining aquatic plants, particularly plants with small or delicate stems.  They are also preferable when planting in fine or sandy substrate and when planting in corners or other hard to reach places.  In marine systems, these tweezers are useful when handling delicate frags or colonies.  To ensure longevity, please rinse the tools in freshwater and dry thoroughly after each use.