Amazon.com: 100% Natural Wool Roving Top, Un-Dyed Dark Chocolate, 8 OZ Corriedale, Made in South America, Best Core Wool for Needle Felting, Wet Felting, Spinning, Dryer Balls, Big Yarn Roving, 28.5 Micron :
DIY Wool Dryer Balls: How to Make Them and Why You Should!