This is a really nifty keyholder. The way you introduce the key is from the top of the holder and slide it down the narrower end where the key should sprout out.
A slight issue I have is that the keyholder is kind of big so after a while the key will slip inside. No biggie, just push it out when you're about to use it and that's all.
The rubber part where they keyring goes is really sturdy. I've had mine for about a year already and it shows no sign of wear.
Overall, I am happy with the product : )