Zomei 10 in 1 Square Z-PRO Series Filter Holder Support + Adapter Ring 72mm + Full Grey ND2+ND4+ND8+ND16 + Gradual Grey ND2+ND4+ND8+ND16 150100 Kit includes:Full ND Filter Set(ND2, ND4, ND8, ND16) + Graduated ND Filter Set(ND2, ND4, N8, ND16) + Metal Adapter Rings 72mm + Square Filter Holder The full ND filters(ND2, ND4, ND8, ND16)reduce the amount of light reaching the film without affecting the color. Can be used to enable slower shutter speeds. The graduated ND filters(ND2, ND4, N8, ND16)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 72mm adapter ring is made of high quality anodized black aluminum(metal). The square filter holder allows for creative use of light correction or special effects.