A retractable coil springs cord is designed to securely hold your keys, small tools, electronic devices, key cards, flashlights, identification badges, or other lightweight items while providing easy access, and convenience and helping prevent loss.

Advantages
There is a key ring where keys can be attached. The key ring provides a secure way to hold multiple keys and allows for easy removal or addition of keys as needed.
With a retractable coil springs lanyard, your attached item can be easily extended for use without having to detach it from the lanyard.
The coil springs keychain usually includes a clasp, to keep your keys firmly attached to your pocket, purse, or bag.

Notice
Please note that there may be a slight difference in the size of manual measurement.