A rigging term, a Span Set is one loop measured from end to end. It is also known as a Polyester Sling, Poly Sling, or Round Sling. It is called a set, but is one product. Used in construction, circus, and theater rigging, mostr span sets are black.

More specifically, a Span Set is one loop of polyester strands inside a black web cover. It can be wrapped around a truss or beam. When using around a beam or truss it is essential to protect the span set from the edge of a beam or truss with padding to prevent any movement from potentially cutting into the span set itself.

The span set is pliable, and can be used in a choker shape, which prevents it from sliding along the beam or truss. Draped over the beam in a U or basket shape is the strongest method. It is also possible to link 2 span sets together, but this reduces the rated capacity of each span set.