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.  
 
These lovely earrings take their pattern from the Eastern Tiger Swallowtail butterfly.  With its bright yellow and black wings, this butterfly is one of the most familiar ones you'll see.  This butterfly's wing span can measure up to 5.5 inches! 
 
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.