The ProMaster Digital HD Protection Filter is an extremely high quality optically clear filter designed primarily to protect your lens. Constructed with premium Schott optical glass and 12 layers of anti-relective coating, these filters are designed to yield extreme image sharpness. They also feature a precision machined, super slim aluminum frame with anti-reflective matte finish and knurled edges. 

+ Premium Schott optical glass + 12 layer anti reflective coating + Precision machined aluminum ring with matte finish and knurled edges