Blisstime 2 Pairs of Bi-convex Biconvex Lens Set 25mm Diameter 40mm Focal Length for Google Cardboard

Biconvex Lens Set, Pop-Tech Glass Lens Bi-Convex 34mm Diameter 45mm Focal Length Lens for DIY Google Cardboard VR

Eisco Labs 6 Piece Premium Optical Glass Lens Set, 50mm Diameter - 3 Double Convex (20, 30, 50cm FL) and 3 Double Concave (20, 30, 50cm FL)

Biconvex Lens Set, Pop-Tech Optical Glass Lens Bi-Convex 34mm Diameter 45mm Focal Length Lens for Google Cardboard VR

American Educational 6 Piece Glass Lens Set

Zehhe Copper Foil Tape with Double-Sided Conductive - EMI Shielding,Stained Glass,Soldering,Electrical Repairs,Slug Repellent,Paper Circuits,Grounding (1/4inch)

PKG (4) 2" Square Linear Polarized Filter Slide has a 1-3/8" x 15/16" Window.