Neewer Complete Neutral Density ND Filter Kit for Cokin P Series:Full ND Filters (ND2, ND4, ND8)+Graduated ND Filters (G.ND2, G.ND4, G.N8) + Metal Adapter Rings+Square Filter Holder ** PLEASE NOTE: CAMERA & LENS NOT INCLUDED! ** Kit includes:(3)Full ND Filters (ND2, ND4, ND8) + (3)Graduated ND Filters (G.ND2, G.ND4, G.N8) + (9)Metal Adapter Rings (49mm, 52mm, 55mm, 58mm, 62mm, 67mm, 72mm, 77mm, 82mm) + (1)Square Filter Holder + (1)Filter Carrying Pouch. The Full ND Filters (ND2, ND4, ND8)reduce the amount of light reaching the film without affecting the color. Can be used to enable slower shutter speeds. The Graduated ND Filters(G.ND2, G.ND4, G.N8)are a MUST for digital users, because the digital sensor unlike film has very low exposure tolerance. Detail will be lost on both low and high light area. To correct this, you need graduated filters to balance it! The 49-82mm Adapter Rings are made of high quality anodized black aluminum (metal).Same filter for all your lenses by just replacing the adapter ring. The Square Filter Holder allows for creative use of light correction or special effects. Simply mount the adapter ring and filter holder to the front of your lens, then slide in different filters to take beautiful, colorful shots.