sval, the dryer balls are just that....balls that you put in your dryer while drying clothes. They reduce the drying time & also reduce static. They are dryer sheet replacements. You can lightly scent them with a good quality essential oil if you like.
Here's a link that tells about them:
http://goodmama.typepad.com/goodmama...yer-balls.html
If you do a web search you can find more sites with instructions.