(58MM , 52MM) Adapter Rings & Filter Holder for COKIN P Series System + Super Fine JB Digital Microfiber Lens Cleaning Cloth Includes: 1 x Square Filter Holder / Adapter Rings (52mm, 58mm) for Cokin P Series. Screw the ring adapter onto your lens. Slide the colour filter holder on the ring adapter until it snap in place. The Ring Material is aluminum. Included: JB Microfiber Lens cleaning cloth.