I looked on mine, and I couldn't tell. But, it looks like 500mL. But, unless you are a dermatologist and need to use it 20 times per day, you don't much liquid nitrogen anyway.
As far as parts, it should come with some. Our has a very small one with an L-shaped end and several nozzles that come in four different sizes. We generally use the very small one as you can get a lot of precision with it. The others blast away.
The only really stupid thing is they give you two clear plastic templates. They both have the same size holes. And, they are something like 2mm, 4mm, 7mm, 9mm and 11mm. Why they don't have 1 through 12 on three different ones makes no sense at all.
