Nellie's dryer ball is made of 100% pure New Zealand wool. Toss 4 dryer balls into the dryer to reduce drying time, soften fabrics and reduce wrinkles. All without the use of any chemicals. Features: -Use all 4 wool dryer balls for shorten drying time -100% natural -Separate natural fabrics from synthetic fabrics to help reduce static -Soft and silent -Safe and natural fabric softener -Reduce wrinkles -Phthalate free -Made of wool, they absorb water. This has the upside of reducing the drying time up of 25 to 30% -For people who wants their laundry to smell great (which is often the main reason why they buy fabric softener), you can also add a few drops of essential oils to the balls as they are odourless -They can also be used in the dryer to allow the duvet to return to its original form while drying