There are three main components here: the feathers, the clamps, and the rubber grips to cover the metal on the clamp itself. The rubber grips are soft and flexible; they are also easy to slide off, and can be removed should you find yourself in a pinch while trying to remove the clamp.
The metal appears to be stainless steel, and the screw measures .75 inches, while the feathers are a little over 3 inches in length and about two inches across. The feathers are really soft and feel just like real feathers, without involving real birds. The clamps appear to be sturdy overall, and the metal is thick enough to provide structure without adding unnecessary weight.
These clamps are very easy to use; anyone can use them - male or female - regardless of your body type. Just simply adjust the screw to the level of pressure you prefer and have at it. They will keep the nipples erect for as long as you would like and, of course, any direct stimulation to the area will add to your pleasure!
I really love these clamps. I have been researching nipple toys for quite some time, and I already knew I did not prefer the tweezer style of clamps, so I was really glad when I saw these. The most notable thing is there is no way to avoid being tickled by the feathers when I move, so it definitely heightens the sensation and kind of makes me aware of more than just my nipples at the time.