1,Material: Pyrex, Optical glass, Crystal glass 2,Size and shape: customer's requirement 3,Lead Time: 30 days 1, Techniques of Optical lens: by ... bi concave lens, ball lens,Spherial lens 3, Inside quality of Optical lens: clear and transparent, no mold marks, no ... inside bubble and dirts, 4, Function of Optical lens : Lighting splitting,magnifying etc. 5, High transimission Optical Glass Lens