If you got in on the wool dryer ball promo before it sold out...lucky duck!!! I'm glad I bought some during the last sale. Here's my solution to replacing toxic fabric softeners and dryer sheets. Add 2 drops of Lemongrass on two dryer balls and add 2 drops of Lavender on the other two dryer balls. Yummy smelling laundry that is static free. Other good oily combos are Joy and Lemon and Purification and Lemon.