Double Concave Lenses Set of 50 pcs : 38 mmd X 15 cmfl - National Geographic Video These stories are truly filled

These stories are truly filled with silver linings

Constructed with a blend of 4-ply cotton

Its refreshing citrus floral scent and golden color leaves you feeling energized

This is made for classroom use for activities in small or large groups

Double Concave Lenses Set of 50 pcs : 38 mmd X 15 cmfl - National Geographic Video These stories are truly filledDouble concave lenses have two inwardly curved surfaces a negative focal length and are often Superior quality lenses are useful for teaching a variety of optical principles.. Size 38 mm. D X 15 cm. fl. Details: Size 38 mm. D X 15 cm. fl. Package Quantity: 50 Excellent Quality Great Gift Idea Satisfaction Ensured.