Dryer balls are eco-friendly, unlike dryer sheets, and they are reusable. They typically last up to 1,000 loads of laundry or about two to three years. Even though dryer balls may experience pilling, they are guaranteed to continue softening your clothes without added toxic chemicals of dryer sheets. To send a dryer ball, simply add 3-4 drops of essential oil before every other load. For small loads 2-3 dryer balls are enough, for large loads you should use 4-6 dryer balls.