These are carts (cartridges) which are designed to be used with 510 atomizers (901 as well, I believe). There is some sort of filler in there that you fill with your
juice. So, you end up with two pieces: the cart and the atomizer bottom portion which contains your coil. These may or may not be pre-loaded with some sort of
juice.
Easy to confuse with cartomizers (cartos). Basically, a carto is one piece which the filler and coil all combined. The cartomizer has been more popular because they are a lot cheaper and easier to deal with than the cartridges/atomizer, not to mention the fact that there a great many different types available.
Unless you have atomizers, you cannot do anything with them. Well, I suppose you could load them into a slingshot and shoot them at someone you are not too angry with since they are made of plastic and won't hurt too badly.