a rubber - In America, it’s a wiener cover. In Britain, it’s what you u

In America, it’s a wiener cover. In Britain, it’s what you use to rub out your mistakes before they become permanent.

"I used my rubber to erase my math test. Now I have to do it again."

"He brought a rubber to the party, but it was the wrong size."

"She said she’d bring a rubber, but she brought a pencil."