Dryer Balls eliminates ironing and turns your dryer into a wrinkle releasing machine. Add water to dryer balls and toss into dryer. As dryer heats up, the balls will steam the wrinkles away. Shirts, pants and slacks will look pressed and wrinkle-free. It even works on sheets and pillowcases for a fresh, smooth look. No need to iron. Works on all fabrics, cotton, poly, blends. Plastic, 4". Set of two.