Need coasters?  Buy these.  6 with a container for this price is awesome.  They fit right in with most styles and I love that they're rubber and studded.  I hate when I have a sweaty glass on a flat coaster, go to lift it up and the coaster is stuck to in for half a second then falls in my lap.  Not with these.  They don't slide around and look great.  

Pros: not just 4, but 6 in this set.  great looking and inexpensive.  love rubber coasters. Don't stick to your glass.
Cons: NONE