These 100% pure New Zealand wool dryer balls are a great natural alternative from harsh dryer sheets. Toss into your dryer to remove wrinkles and save drying time. You can also add essential oils to the wool for a natural fragrance, allow the oil to fully absorb and dry before using. Wool Dryer balls for dark fabrics by Maywood Market Fabric Care. Bag includes four dryer balls made of 100% unbleached New Zealand Wool.