Since 2015, this NYC-based design company has been creating giftable objects that, as they say, "ignite a sense of wonder." A helix-shaped steel wire with turned end-caps. Simply unscrew the knurled side to add or remove keys. A daily, tiny joy.
1/8" brass wire.
2" x 1/4".
Steel.
To polish, apply a small amount of metal polish to a cloth, wipe onto surface of metal, and then wipe off with clean cloth.