Polished aluminum. This is the wider version of the two that Linus offers. 550mm x 155mm. 25.4mm clamp. These bars will not accept bar end shifters as the interior diameter is approximately 16.5mm.
Bought these handlebars to change over a Gary Fisher Wingra "hybrid" bike (what did that ever mean?) into a more upright cycle. Added Ergon PC2 Pedals, a Tubus Minimal rear rack, and an Ortlieb QL3 "Downtown Commuter" pannier and I am spandex-free and all set. Trying to teach these Houstonians that they, too, can bike to their office and not look like astronauts (or cowboys). The handlebars look and feel great. I had to have the brake and shifting cables re-done since these bars need a bit more length. It was worth every penny. I use them with my old Ergon grips, but probably nice cork ones would be more suited to the shape now.