These earring hooks are made from nickel-free, lead-free metal alloys.
They are hypoallergenic.
The gauge of these earrings is 20 mm (the most common gauge for earring hooks). 
They are sold as a pair.
AVOID getting ANY water, lotions, perfumes, or oils on these earrings.  
 
Distinguished from the Emerald Swallowtail by its brighter green hue and red eye-patterns located on the lower wings, the Green Swallowtail flashes its pattern on these enchanting earrings. 
 
I hand make each individual piece of jewelry so each piece may vary slightly from what is pictured, perhaps in the hook color or the relative size of the butterfly wing.