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Concave Lens Set, Premium Optical Glass Double Convex and Concave Lens Set, 30mm Diameter, 3 Double Convex, 6 Piece Set Size 2x6pcs As Shownx6pcs sold2025 nylon material with high elasticConcave Lens Set, Premium Optical Glass Double Convex and Concave Lens Set, 30mm Diameter, 3 Double Convex, 6 Piece Set Product Features Concave lens diffraction grating lenticular sheet binoculars fresnel lens round glasses science lenses diffraction sheet pocket telescope lenses science convex and concave lenses physics: lab uses Round glass: widely use: used in scientific experiments and classroom demonstrations. Glass lens: wide range of