These "chicken cutlets" are silicone breast enhancers that you place right under your breasts in your bra.
Pros:
Makes breasts look a couple of cup sizes larger
Great cleavage effect - combine with the cleavage clips you find at Wal-Mart in the pink box(they are fairly comfortable but not the most comfortable) for ultimate cleavage effect (like the kind from a really good bustier)
Very comfortable... makes wearing non-padded under-wired bras very cozy. Like gel pads for shoes.
Feel very durable, if by chance dirtied they are easy to clean

Cons:
It won't say it here but I find it very unlikely that this will fit in an A, B, or maybe even a C size bra. I wear a 32F and these are about an inch smaller than the cup for my bra.

For your convenience, the measurements:
length of this enhancer is 6 inches, or about 15 cm
width is about 1 inch or 2.5 cm
the height is 3.5 inches or just over 7.5 cm

If you're interested in this product I would suggest measuring out the room in the bras you intend on using these with before purchasing.