The Haida PROII 100x150mm Multi-Coated graduated neutral density filter is made of high quality Schott glass. Graduated Neutral-Density ND filters help to reduce and modify bright areas of an image to bring balance without altering hue or color rendition. This is especially helpful when shooting landscape photography under bright skies. This filter features multi-coated MC scratch resistant glass. This provides your camera lens protection from abrasion and also reduces glare and lens flares.