Case for your SIM key. You will never lose or brake it again. Will never again search for paper clip to open your SIM card tray in your smartphone. It fits SIM key perfectly and it's easy to take out even with almost no nails as mine ;)

It was designed for Xiaomi's SIM key and I don't know how well it will fit standard SIM keys, but I think at worst scenario it will stick out a little more.