Ribbon of metal, folded and twisted to fit the ring. Each one is slightly different as metal is hand formed and bent.  See Sarah Gorden in wear this piece,

~.5" wide strip 

~sticks about .25" above the finger.

Ring is hand fabricated in brass and finished with 14k nickel free plating

Also available in sterling silver.

Bold, sculptural, modern and fierce jewelry handmade in Brooklyn, New York