braided picture wire
https://16679qugm5.greyhavendaily.com/posts/mastering-double-d-ring-mounting-for-secure-picture-hanging
Braided picture wire is the go-to for securely hanging framed artwork, made by twisting multiple strands of steel together for extra strength and flexibility. It's a practical choice because it won't stretch or sag over time like single-strand wire, keeping your pictures level on the wall. You'll usually see it with a nylon or plastic coating to protect both the wire and the wall surface it touches, and it comes in different gauges to support various frame weights.