OLSEN+OLSEN gray dryer balls are made of natural materials. Why use plastic when you can use a naturally sourced product? When you add dryer balls to your dryer, they will help to: * reduce cycle time and save energy * reduce wrinkles * reduce static electricity * avoid chemicals that saturate commercial dryer sheets They are handmade with organic wool. They soften your laundry naturally without any of the chemicals of conventional fabric softeners. Unlike the plastic dryer balls, they are PVC free and won’t fall apart or melt on you. These dryer balls save time and energy by cutting down on drying time by an average of 25% per load. They also help reduce static and wrinkles. Dimensions: 7 cm diameter each ball Information about the product: Add a few drops of your favorite essential oil (pairs well with Ivory & Iron Room & Linen Spray) and throw them in your dryer. Your clothes will smell fresh, have less wrinkles and you avoid static electricity.