These spectacular handcuffs are state of the art.  I first viewed them as a guest of Yuil in London a while ago

At first glance you might think they are exactly the same as the ordinary M-11s but there you would be wrong.

Firstly, each 'cuff is lined with a thin layer of silicone to make the part of the handcuff that comes into contact with the wrist a good deal more comfortable, secondly the two lever key is very slightly smaller, along with the key hole so these handcuffs cannot be opened with a standard Yuil key.