(Not what they sound like LOL)
These are little patchwork or woollen balls that you put in with your washing in the dryer. They help the washing "move around" inside the dryer, causing the air to circulate better and hence a shorter drying time = less money spent on electricity. A bit like how you put an old sandshoe in when drying sleeping bag to keep the loft in the feathers.
Now, I know what you are going to say about dryers...we shouldn't use them! and I do try not to. But sometime when the weather is conspiring against you and the washing just won't dry any other way, I resort to it. My dryer is actually a fairly recent addition to our household. We have had it about a year, I really wish I had it when we lived in Cromwell cos there in the winter it was so hard to get washing dry that I used our local laundromat in desperation.
However, I have made some more "dryer balls" and a pix will come soon of these cuties.
(pop about 4 in the dryer with your washing)