The Xiaoyztan Plastic Detachable Aquarium Water Heater Protector Fish Tank Water Warmer Guard is designed to be a safe and reliable way to keep your aquarium water warm. The multi-section detachable design allows you to adjust the length at will, and the compact size makes it easy to install in your tank. Made from high quality materials, this water heater protector is non-toxic to water quality and fish, and is safe to use.