Review on 🃏 IdeaWorks Arc Playing Card Holder (Set of 4), Card Holders for Seniors & Kids, Curved Design Prevents Card Viewing, Holds up to 15 Cards by Charles Lewellen

The title says it all. They fit well, are a comfortable weight, and allow a small child to have a large hand with cards visible to him but not to other players, greatly increasing interest in card games. Slot width varies between different holders in a set or even within the same holder. So I wouldn't use that for cards I treasure. However, it is not obvious what the optimal single card width would be in order to hold cards securely but not damage them, as cards vary in thickness. A very soft spring mechanism would probably be best, but this product is very good for the price. The plastic didn't have a strong odor, which was good.