Because of the colorful designs, I assumed that these clickers were made of plastic and would not hold up under much use, but since there are 12 in the package, I ordered them anyway. The body of the clicker and the tongue are metal.Some of them are louder than others, and I like the loudest ones best.They are great for dog training and also for getting the attention of any group (not just children) without raising one's voice. One thing I like about these clickers is that they get everyone's attention, but it is nearly impossible for people to tell where the noise came from. This is useful if a meeting is getting contentious, and also great for occasional party jokes.Fun fact - if any of your friends went to Catholic school "with the sisters", these clickers will either make them a little crazy or very nostalgic for the good old days.WARNING -Do not give these to your children or anyone else's, unless you hate them. Hate the parents, that is, who will soon be driven mad. : )