Big solid steel orgasm balls that weigh 250 g (0.55lbs) each. They are supposed to be hard to keep inside because they are so heavy, but I could hardly get them out (or in) because they are so ridiculously huge. They did however make me squirt. I didn't even know I could squirt before this! For those who saw the vid and wonders what happened with the second one, it took me several hours to get it out! I was meeting up with some friends after shooting this and I had to have it inside of me the whole time, but that's our secret now, okay? ;)