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FILTER GLASS For ultra high performance optimum optical flatness, the high quality Schott optical glass with high density molecular structure has been finely grinded and polished to perfection. * Material:High quality Optical Glass * Thickness: 1.6±0.1mm * Surface Process: Double-faced Fine Grinding and Polishing * Surface Planeness: 5/2×0.16 FILTER FRAME High Quality Aviation Aluminum. Aviation aluminum material is light, difficult to deformation and corrosion resistance. * Height: Total Height: 5.7mm Net Height: 3.1mm * Material: Quality Aluminum Alloy * Surface Process: Anodizing; Matte Black