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 on these earrings!
 
Another of my personal favorites, the Nymphs of Singapore butterfly is absolutely stunning with its soft black lines fading into shimmering white.  These earrings capture this butterfly's lovely wings to perfection!
 
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.