Product is exactly what I wanted!
I really like them.  I had a similar type of smoother and buffer that came in at hand care kit.  I have thin, fragile nails and buffing them keeps down the breakage.  However, I didn't need the other products in the kit so looked for an alternative.  These fit the bill perfectly and are easy to use.  None of the sides are a rough grit and its very kind to your nails.
Rating: 5 stars