Survival flint used on survivorman or man vs. wild?

Hi about a month and a half ago i was watching either survivorman or man vs. wild and either les or bear had this certain flint, that you put a peice of tinder in an end of an open cylinder and with the other end that closed it he shoved it hard in to make it generate pressure that generated heat, and he ignited the tinder and started a huge fire. My question is what kind of flint was it because i cant find it anywhere and ive been wanting to know what it is and called, Thanks for your time