2 Dryerballs Tumble Dryer Balls 5 "Really make a difference with sheets and towels" Susan 06 May 2018 I've found these dryerballs work very well in my machine. It doesn't have a reverse action and sheets would often get wound into a tight bundle but since I've been using the balls this hardly ever happens. They do help to soften other washing, too, especially towels. But I put my really delicate scarves in a net bag first and just give them a short tumble. I'm completely satisfied with these dryerballs - I've been using them for over a year and they are just as good as when I bought them.