Shower curtain rods are made from metal and high-grade coated plastics.
Contemporary fittings come in a wide range of surface finishes and coatings that match any kind of shower interiors - from lifestyle and designer to functional. Some popular options are natural steel, chrome, nickel, copper, brass, and oxidized iron finish. The surface could be high-gloss, matt, semi-matt, vintage rusty, and so on.
When selecting a shower rod to match your bathroom decor, there are some general rules, but nothing really carved in stone. For contemporary, minimalist bathrooms, go for natural steel, straight lines and high gloss finishes. Vintage, rustic and eclectic bathroom spaces look best with mat black finishes or rusty-looking materials such as copper or brass.
Considering the moisture and heat factors of the shower environment, most shower rods are rust-proof.