The dryer balls are made of wool grown from our sheep on the farm. We started with Pumpernickel, Baguette and Brioche and now we have many more. Wool naturally absorb moisture. When placed in a dryer to dry your clothing, the wool absorbs all the water and reduce the drying time in half. Not only do you save electricity but there are no chemicals involved ( unlike dryer sheets) and the ozone will thank you. You can add a drop of essential oil like lavender to add scent to your fresh linen. The color of the balls will not affect your clothing. These dryer balls are huge ( at least 3 oz) and will last a minimum of 60 loads of laundry. Once they are done drying your clothes, you can return to the earth in your compost and they will decompose and not add to the landfill volume.