I'm not sure what the material is, but it's lightweight. I found this while decluttering my grandmother's house. I think it's very old. Two of the plates have what looks like rust, and there is also clouding. For those who understand. I'm also not sure how to use it. - Set includes: 5 plates, 5 perforated plates?, 2 spoons - Types of spoons: slotted spoon and regular spoon Thank you for looking.