Sigma Digital WR Filters are both Oil and Water Repellent coated, SMC coated. Protect the lens surface from dirt and dust as well as scratches. Water and Oil repellent-repels water & resistance to fingerprints/smudges. Antistatic glass prevents microscopic dust from clinging to surface. Hard Anodized Black Finish, Low Profile Filter Rim. Made in Japan | Sigma 49mm Water Repellent Lens Protector Filter