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• 10PCS 4 Projection Necklace Lens Optical Glass Plano Convex Cylindrical Lenses for DIY Creative Gift Specifications: Item: Optical focus, nano necklace Material: Heavy lanthanide optical glass Dimension: 4 Effective aperture:> 90% Process: Fine grinding and sprucing Lens precision: λ2-λ10 Package: 10 PCS/Lot Picture show: 10PCS 4 Projection Necklace Lens Optical Glass Plano Convex Cylindrical Lenses for DIY Creative Gift Specifications: Item: Optical focus, nano necklace Material: Heavy lanthanide optical glass Dimension: 4 Effective aperture:> 90% Process: Fine grinding and sprucing Lens precision: λ2-λ10 Package: 10 PCS/Lot 10pcs Plano Convex Cylindrical Lens Necklace Nano Projection Lenses Optical Glass Magnifying DIY Creative Gift

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