Is Tungsten magnetic? I dropped my boyfriends ring (made of Tungsten) down the place in the doorframe where the door closes, not knowing there was actually a hole there.
Use commas to separate things in a list or series. If you have a series of three or more items, use commas to separate each item. Do not place commas before or after the list or series. Do not use commas when all the items in a series are linked by and, or, or nor.
Commas are generally used when listing things, separating a sentence with the same thought, and before quoting someone. A list is pretty self explanatory, but an example would be: do this1, this2, and this3. I've heard around that you don't need to use a comma before the and, which is not true.