Includes (4) - Two Pack of Blue Dryer Balls (8 Total Balls) Soften your clothes naturally with Mainstays Dryer Balls. These durable dryer balls are made of a non-toxic material. They can make your clothes fluffier and reduce wrinkles without the use of harsh chemicals. Mainstays Dryer Balls make a great, eco-friendly alternative to dryer sheets or liquid fabric softener.