T.B.
Never heard of "mettle eggs." Don't know about quality plastic eggs either. Why the expense for "quality" when they will be used for such a short time anyway? I say go to a dollar store and go that route. The kiddos are only interested in whats inside the eggs anyway. They could care less if the plastic eggs cost $5 or 50 cents. I'm sorry I can't be more helpful. I hope you find what you are looking for, though.