Emma, it says in the description that they are plastic. Here's what it says"
"Set includes an assortment of interchangeable plastic templates to create 11 or more designs."
BUT, in the reviews on Amazon, someone said this:
"i have a few sets of these, and while they are innovative, convenient and creative, they are smaller and a bit insubstantial compared with what i expected. but, they're pretty inexpensive so all is not lost. "
So, they are probably pretty little. I think I will just buy the Omingrid mini set.