PMMA plastic. Double Convex Lens.
1pc 20mm Glass Double Convex Lens - Optical BK-7 Lens for Photography, Science Experiments, and Optical Instruments
Quartz glass double convex lens(D25.4;f30)
Quartz glass double convex lens(D40,f=33)
Glass double convex lens(D20;f17.8)
1pc Double Convex Lens Set - 30mm, 36mm, 40mm, 50mm - High Transparency Optical Glass Magnifying Lenses for Clearer Images(50mm*130mm)
1pc Double Convex Lens Set - 30mm, 36mm, 40mm, 50mm - High Transparency Optical Glass Magnifying Lenses for Clearer Images(36mm*90mm)
