These earring hooks are made from nickel-free, lead-free metal alloys.
They are hypoallergenic.
The gauge of these earrings is 20 mm (common gauge of earring hooks).
They are sold as a pair.
AVOID getting any water, lotions, perfumes, or oils on these earrings.  
 
These striking earrings pattern the wings of the Anise Swallowtail butterfly.  A look-alike to the Tiger Swallowtail butterfly, the Anise Swallowtail also carries bold stripes of black and yellow.  Interestingly, this butterfly's main food is members of the carrot family as well as the citrus family!  
 
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.