Buttons Diapers has made a quality and durable set of wool dryer balls! This is another absolute new favorite of mine. These things help out so many things I was having trouble with in my dryer and with my clothes. In love with these for sure. I have used my essential oils in on these as well and i love that my clothes smell so good and dry so much faster with no mildew smell. I am very happy with this product and will definitely purchase in the future. I would also recommend these to others. I received this product for free in exchange for my complete and honest review.