EISCO Concave Mirror, 10cm Dia., 10cm Focal Length

Eisco Labs Optical Glass Lens, Double Concave, 75mm Diameter, 20cm Focal Length - Ideal for Top Spinning

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)

Bruce Charles Designs Schulte Brass Metal Spinning Top | EDC Desk Toys for Office for Adults and Kids | Unique Gift

United Scientific LCV108 Glass Double Convex Lens, 100mm Diameter, 200mm Focal Length

United Scientific MCVSET Glass Mirror Set, 6 Pieces

Concave Mirror 50mm Dia, 100 Focal Length - Eisco Labs

American Educational Concave Parabolic Large Demonstration Mirror, 40.5cm Diameter, 68cm Focal Length

American Educational Concave Spherical Silver-Backed Glass Mirror with Ground Edges, 7.5cm Diameter, 7cm Focal Length (Bundle of 5)

UEETEK Concave Lens,Labs Double Concave Optical Lense Glass Lens 300mm Focal Length 10cm Dia

Concave Mirror - Glass - 150mm Dia - 150mm Focal Length - Eisco Labs