77mm Square Filter Kit for Cokin P Series System. Includes: Adapter Ring + Square Lens Hood + Square Filter Holder + JB Microfiber Lens Cleaning Cloth Includes: 1 x Square Filter Holder / 1 x Square Lens Hood / 1 x 77mm Adapter Ring / 1 x JB Microfiber Lens Cleaning Cloth. Screw the ring adapter onto your lens. Slide the colour filter holder on the ring adapter until it snap in place. The hood simply attaches to your filter holder by pressing the 2 outer sections of the hood to the filter holder. The Ring Material is aluminum.