The condoms are the silicon rubber things that are on the cartos when you buy them. As far as I know they all come with them. Personally I prefer the soft cap cartos. Just pry off the white rubber cap and drip till it looks moist. Blow through it and if it gurgles a bit it's full. If you blow out some liquid it's over full, just blow till you get the excess out. I always made a bit of a mess using the condom method.