2-Pack Double Concave Optical Glass Lenses - Focal Length, Diameter Options 30 40 50 100mm, Unbranded, For DIY/Magnifiers

Got a science project or need replacement lenses?

This 2-pack of double concave lenses is what you're after.

Made from optical glass, you can choose diameters like 30, 40, 50, or 100mm.

Unbranded but new, may come in generic packaging or as a factory second with minor cosmetic stuff—but fully functional.

Great for magnifiers, experiments, or custom optics.

Check the seller's pics for details.