Sling Rings are mystical items featured in the 2016 film Doctor Strange. It is a magical item used by Masters of the Mystic Arts used When performing spells, including battle attacks and portal hopping
Marvel Cinematic Universe: Doctor Strange • Christine Palmer • Ancient One • Wong • Kaecilius • Masters of the Mystic Arts • Zealots • Karl Mordor • Nicodemus West • Thor• Scarlet Witch • Masters of the Mystic Arts, America Chavez, Illuminati (Mr. Fantastic, Black Bolt, Peggy Carter / Captain Carter, Maria Rambeau/Captain Marvel, Charles Xavier)