Srate 1pc Optical Glass 100mm Diameter Focal Length -300mm Large Optics Double Concave Lens

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

Double Concave Lens Even Edges and Thickness - Ideal for Spinning Top - 75 mm Dia 20 cm FL

Eisco Labs Double Concave Glass Lens 75mm diameter, 50 cm Focal Length - 1 Single Lens

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

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

Accurate Spinning Top, Vintage Totem Zinc Alloy Silver Toy Gift

EDC Keychain Spinning Top - Spins Forever (up to 5:27 minutes), Self-Balancing, Precision Machined Stainless Metal. This Keyring Fidget Gyroscope is a Unique Gift For Men/Adults. Desk Toy Spin Top

Eisco Labs Concave Glass Mirror, 10cm Dia., 10cm Focal Length

Ajax Scientific Concave Mirror, 100mm Diameter, 250mm Focal Length

Eisco Labs Double Concave Glass Lens, 75mm Diameter, 30cm Focal Length