So I bought these Halloween cards online last week for offers and exchanges. They were labeled greeting cards and, in my excitement over how cute the designs were, I didn't bother checking the dimensions. Received them yesterday and they're really nice quality but a lot smaller than I expected. They're 10.5 cm x 9.5 cm (approx 4.13 x 3.74 inches). Was just wondering if these are too small? Is there a recommended or required size for cards on RAoC? Should I add other stuff to the envelope to make up for size or should I just send something else altogether? Or are these fine as is and I'm just overthinking this?

Sorry about the newbie questions! I used to swap cards on a different platform and there were very strict rules about things like sizes and etc. So I just want to make sure! Thank youuu 🌼

Edit: I hope this post is allowed here! Wasn't really sure where to ask. If it should be posted somewhere else will delete and post there instead. 😊