The Dual lock handcuffs are best used for ankles and wrists. Though many people have a great imagination on what to do with different toys, those are the main two purposes. I believe this product could be used by anybody. Though I would rather have a little bit of cushion on them, everyone is different. Some people like pain during intercourse, so whatever pleases them. I mainly use them for the wrists. I would rather have something with a longer chain to use for the ankles. Well, the reviews are almost a five, and the popularity vote was in the one hundred top ankle and wrist cuffs, so it seems like a good product for those of you who haven't tried it yet. To me they are.

The material is metal. Here is the description.
Components:
An element that readily forms ions (cations) and has metallic bonds.
Properties:
Metal is phthalate-free and has firm, smooth texture. It is usually shiny, with a high density, ductile and malleable, usually has a high melting point, and retains heat well.

It was built rather nice. I can see it lasting for a long time as long as it is not mistreated too bad. It was voted 9 out of 10 for material safety so that is pretty good. And a good note for all that is allergic to latex.
Safety features:
Food-grade material / latex free / non-porous / phthalates free
I find that satisfying since my partner is allergic to latex.
It fits pretty well on her wrist and mine. I don't believe that bigger people will have much of a problem with it.

This product worked pretty well for my partner and I in my opinion. I have had many different handcuffs, and the only ones I have found that have became my favorite of all time is the actual police handcuffs. Though these are not them, they don't fall too far behind. These are well made handcuffs and I would recommend them. I have not tried using them in a solo act due to the fact that I need my hands. It doesn't work out well for me. But for my partner and I, as long as she doesn't leave me tied to the post in a way of saying, we had fun with them. One problem I have with handcuffs like these are that if you apply too much pressure, they can begin to bend and it will not be as comfortable. It is hard to bend them back to the way it was originally. I have not yet had that problem with this particular set of handcuffs, but I have from some in the past, so I am bracing myself for when this set finally does it. I'm not for sure if it will or not, so don't take my word for it.

Metal toys can be boiled or be bleached (10% solution), are dishwasher safe (top shelf), or can be washed with soap and water.

As my personal experience with this product, so far I love it. Though it doesn't compare against the real thing, I still like them. I would recommend this to anyone who can not get their hands on a real set of handcuffs.