Which women's artistic apparatus has two bars set at different heights?

The women's artistic apparatus with two bars set at different heights is the uneven bars. The higher and lower rails let gymnasts swing, release, and transition between bars in one continuous routine.

The apparatus is also called asymmetric bars, especially in some international terminology. Modern bars use fiberglass rails with a wood coating, supported by a steel frame. In competition, the high bar is about 250 centimeters from the floor and the low bar about 170 centimeters, though exact setup measurements can vary.

The uneven bars are one of four women's artistic gymnastics events, alongside vault, balance beam, and floor exercise. A common mix-up is calling them parallel bars: men's parallel bars have two rails at essentially the same height, while women's uneven bars deliberately use different heights. Nadia Comăneci's first Olympic perfect 10, at Montreal in 1976, came on this apparatus.