Pokemon Coin Holder for sleeve folder

My son's Pokemon collection is in a three ring binder with card sleeves, and he wanted to keep the coins he has in there as well, but they kept rolling right out of the sleeves. This fits in the card sleeve, and has a circle for the coin to fit into, so you just insert the coin into the holder, and slide the holder into the card sleeve, and it won't slide out and fall out of the folder.