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 either used in lists (like the above example), or when you are saying a sentence and need to pause or take a breath in the middle of it. Commas always come straight after a word, never a space and then the comma. Example: word, is correct. word , is not correct.