Complete ND Neutral Density Filter Set For Cokin P Series -- Includes: Adapter Ring Set (49MM, 52MM, 55MM, 58MM, 62MM, 67MM, 72MM, 77MM) + Filter Holder + Square Lens Hood + Graduated Neutral Density ND2 ND4 ND8 Filters + Full Neutral Density ND2 ND4 ND8 Filters + Super Fine JB Digital Microfiber Cleaning Cloth Includes: 1 x Square Filter Holder / 1 x Modular Lens Hood / 1 x 49mm, 52mm, 55mm, 58mm, 62mm, 67mm, 72mm, 77mm Adapters Rings for Cokin P Series / 1 x Graduated ND2 Filter / 1 x Graduated ND4 Filter / 1 x Graduated ND8 Filter / 1 x ND2 Square Gray Full / 1 x ND4 Square Gray Full / 1 x ND8 Square Gray Full / 1 x JB Digital Microfiber Cleaning Cloth. 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. Think of them as sunglasses for your DSLR.