Yubico Yubikey Neo Cover
thingiverse
If you've got a Yubico Yubikey Neo, Standard, or U2F key, that picture of yours on https://www.yubico.com/products/yubikey-hardware/ is probably covered - this case lets you keep it on your keychain safely while defending against scratches and damage. It wraps snugly around the Yubikey so it can only be taken in and out with force applied directly from two distinct sides.
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