Double Convex round Lens, Material: Glass, designed for physics and educational uses, Because of their educational use design, there may be minor imperfections that do not affect physical function, for educational uses, Size: 50mm focal length, 2in diameter and 3.5mm thick
Bivalve Fossil Replica, Made from a sturdy resin designed to last through heavy classroom and laboratory use, Filter feeders, Looks like a shell, Perfect for use in the classroom during lessons on fossils and paleontology, Size: Approx 1in (3cm)
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