All Hail The Black Market Key Leash
A key leash from cult cycle brand All Hail The Black Market.
Good for attaching to bike lock keys. Probably works for other types of keys.
Available in black, red, blue, purple and don't care (e.g. we'll send you the first one we grab.)
All Hail the Black Market says:
"Back in the early and mid 90s when I was a bike messenger in San Francisco, these leashes were the only way to go in keeping your key always close at hand."