I am gaga over these felted dryer balls. I have been using mine for about half a year now and wish I had them many, many moons ago. They really do work in your dryer by helping seperate the clothes during tossing for a shorter drying time which saves energy and money on your PG&E bills. Yay! Plus, they are almost waste-free. No more fabric sheets to toss in the trash. I only use 3 balls, but most people recommend 6. I've been doing okay with 3 but I may end up buying a few more for the new year since I still get a little static cling. Zap!
I purchased mine from Farm Fresh Fiber on Etsy. She's a great seller and you can buy some balls with a little lavender oil to give your clothes an oh-so-fresh scent.