SIGMA WR PROTECTORWater-repellent, Antistatic type:Protector is developed to protect the lens surface from dirt and dust as well as scratches. It is an ideal filter for regular use as it is completely colorless so does not affect color reproduction.Water-repellent (WR) coating:The WR coating reflects only 0.24 percent of visible light, thereby minimizing flare and ghosting. Its ability to repel both water and oil is also excellent: water drops bounce right off, and fingerprints are easily removed with a quick wipe. This coating also of/ers high lubricating ability, giving it more than ten times the scratch-preventing capability of SIGMA's current Super Multi-Layer Coating.Specifications:Filter Type: ClearFilter Factor: 1x (0-Stop)Circular Size: 72 mm Filter ThreadFront Accessory Thread / Bayonet 72 mmCoatings: Multi-CoatingPhysical Features: SlimFilter Material: GlassRing Material: AluminumKnurling: TopIn the Box:Sigma 72mm WR (Water Repellent) Protector FilterFilter Case