Material of metal strap: stainless steel 304,316L, Monel or others.

金属带材质：不锈钢304，316L，蒙乃尔或其他。

youdao

The man also had a watch on his left wrist, which is described as having a white metal strap and a black oblong face.

BBC: Glasgow & West Scotland

If it were metal the case would probably destroy the shoulder strap relatively quickly (not to mention your shoulder).

FORBES: Connect

After a chopper drops off guests in an idyllic wildflower-covered valley, mountaineers strap on helmets and harnesses, clip their via ferrata lanyards to the metal cable bolted to the base of Mount Nimbus, and begin to climb.

BBC: North America by cable and bridge