... Origin Guangdong China (Mainland)MaterialOptical GlassFilter Ring MaterialaluminumType CPL filter Size:30.5mmColorSilver and blackGlassThickness1.9mmRing Thickness7mmpackagePlastic box 3 ... 58,62,67,72,77,82,86 Multi-coated filter / MC UV filter 25,27, 28,30, 34,37, 40 ... ,86 7. Why must be OEM filter manufacturer ? -Over 6 years professional filter manufacturing experience in filters. -Own an integrated ...