I received this from a friend who doesn't use it. I don't know the detailed usage instructions, so please refer to the images. There are no noticeable scratches or stains on the filters or frames. This is a used item, so please refrain from purchasing if you are looking for something in new condition. PolarPro "DiveMaster 3-Pack Dive Filter Set" for GoPro Compatible models: GoPro HERO9/10/11/12/13 Black Protective Housing. Features: These filters perform color correction in underwater photography, eliminating the blue or green cast underwater and allowing you to capture natural colors. Set contents: This set includes three filters that can be used depending on the depth and environment. Red filter: For blue water areas (e.g., the ocean). Magenta filter: For green water areas (e.g., freshwater or murky seas). Snorkel filter: For shallow water. Reference price: The manufacturer's suggested retail price is 6,050 yen (including tax).