Bernie Ecclestone has made it clear that he is not a fan of the Red Bull Aeroscreen, which was tried by Daniel Ricciardo on Friday in Sochi.
"We're going to get a lot of pitstops now when they have to stop to clean the screen and things," he said when asked by Motorsport.com about the Aeroscreen. "That will be good."
Asked if he liked the look of it or preferred the Halo, he said: "Not particularly. I don't like any of them," adding that the sport should do "nothing" with regard to cockpit protection.
"I just think to try to simulate something when you've got a stationary object, and you're firing a tyre at it, when in the race when the wheel has come off normally both cars would be moving.
"So how can you simulate it by having a car stationary? And how would you ever know what's going to happen with a wheel anyway?
"If it hits the thing it would probably bounce off anyway. So I don't know," Ecclestone added.
Quizzed on Lewis Hamilton's suggestion that danger was part of the appeal of the sport he said: "In his case I don't know whether the money made any difference as well.
"We can make it more dangerous if he wants."