Dragonflies, which live on every continent except Antarctica, can reach speeds of up to 35 miles an hour and fly just as gracefully backward by lifting off vertically, helicopter style. Dragonflies have extraordinarily keen vision that helps them detect the movement of other flying critters and avoid in-flight collisions. Thanks to two huge compound eyes, the dragonfly has nearly 360° vision and can see a wider spectrum of colors than humans. These antique-silver metal charms have been treated with a protective coating to help prolong their shiny finish. The stainless steel earwires are nickel-free and lead-free.