... : Borosilicate glass, Pyrex, Borofloat, Optical glass, Crystal glass2. Processing: by Molding, Grinding, Polishing3. Surface quality: optical surface quality and well ... marks, no inside bubble and dirts5. Function: Guide of the light beams e.g. Fresnel lens, Plano lens, Bi convex ... Front lens, Refractor, Molded lens, Spot lens, Lamp cover, Lamp shade, Light shade, Light cover, glass cover, glass ...