"Sling rings" refers to a special tool used by fictional characters in movies, like Doctor Strange, to open portals and travel to different places. Full definition
We have worn quite a few different finishes and if you add in a small sling ring your options are then only limited by your imagination. (tandemtrouble.com)
Cascade glided easily through the rings and held securely with large sling rings. (tandemtrouble.com)
I really like this Soul Slings ring sling because of the lightweight, yet super supportive material it's made out of. (thefashionablehousewife.com)