These are as they came in the 80s. They were meant to help your blades stick to the window a bit better - whether they do or not is unknown. What we do know is they are super cool!
Grab them while we still have a stock of them. They simply clip onto the flat on your wiper arm and we have fitted them to mk1, mk2 golfs and t25s. They will fit many other models too.
You are buying a pair.