I purchased two "bags".... so 24 sets of jacks. They came in plastic bags, not the display cards, which wasn't a big deal to me. But the jacks are smaller and lighter than I expected. Yes, they are made of metal... aluminum is a metal. Super light weight and smaller than the ones of my childhood ; it is hard to tell you are even holding them. But you get two balls and 16 jacks per small bag so I can rebag them and have more sets of 10 and a ball. If you looking for good ol' fashioned jacks, these aren't like that. Ball 1 inch (2.5 cm). Jacks 1 cm x 1.5 cm. Did you ever like to grab the stem of the jack and spin it? Can't do that with these... too small to even grab since the post portion is only 0.5 to grab (total of 1 cm across). And too light weight to spin.