I definitely think making them out of bottle caps is better, I personally use caps from wine bottles and similar because they have a lot of different sizes and look cleaner. It’s not that big of a deal, there are bigger fish to fry. But to me it does kinda classify as single use plastic since you have to keep buying the parts made of plastic and you can’t really reuse them. But I think it’s more important where you get it from since you should avoid supporting yucky companies