That has to be a record

A woman goes into her local music store looking for an old record; behind the counter is small young boy.
She says: "Excuse me sonny, but do you have Jingle Bells on a 7 inch?"
He says: "No, but I've got dangling balls on a 9 inch."
"That's not a record is it?"
"It is for a 10 year old."