From Brackish: 

Our best-selling feather hoop earring design, Lane is crafted with black and white guinea feathers.

• Feathers and other materials for each pair of earrings are hand-selected giving each pair a unique coloring.
• All feathers used are all-natural and sustainably sourced.
• Each earring drops 1.25" from the ear. 
• 24k Gold Plated stud with post push back.
• Suitable for sensitive ears (nickel-free and lead-free.