Ultra-thin frame design; Multi-coating applied to both sides of filter; Original Japanese polaroid film Black-rimmed glass; Matt black superfine frosted finish mount; Mount features advanced knurling technology; NISI'S PRO MC CPL offer exceptional value but does not compromise quality of either construction or optics. Especially in Landscape. Seascape etc. Its Ultra thin filter using Special thin film gluing technology and the latest high quality Japanese polaroid film. High quality. Double side more coating and Matte finish knurled mount will give years of satisfaction.