Genuine Fluval Water Polishing Pad designed to fit Fluval Canister Filters for both Freshwater and Marine use. These extra thick micro-pads are engineered to effectively trap fine particles, ensuring clear and healthy aquarium water. They are compatible with various Fluval external filter series including 107, 205, 407, FX4, and FX6 models, contributing to the overall clarity and quality of your aquarium environment. The pads are uniquely designed to integrate seamlessly with Fluval Canister Filters.