These are very well made hinged handcuffs which weigh around 350 grams or 12.3 ounces.  To be honest, I only discovered these little darlings recently as they come in a plain white box and I found them hiding in a corner!  These really are good quality, the back loading, for example, is the convincing 3 ratchets you get with TCH and they have 3 independent ratchets as well.  I don't have many of these so don't hesitate!