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They go by a myriad of names, I search them out mostly by shape: I look for about a 50mm rise, 550 width and a sweep in the 45ยบ range. Always steel, sometimes cromo, always shiny... I've tried so many Nitto and other bars but always go back to these, though starting a few years back when people here were laughing (a little) less at my choice for upright bars there was (and is) the criticism that they're too narrow. Not my experience, though I do have narrow shoulders.
Wald, Pyramid, Zoom, Hsin Lung, Dimension, Sunlite et cetera.
My fav swept backs are about the cheapest available, so trying something out should be extremely low risk, even lower if you find an old set which are ubiquitous.