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Well when you use them you don't need a cart. You use them in place of a cart. One model works with 901s and 510s. The other model works with pen styles(801s). They have an o-ring on them so they don't get loose like carts do and the o-ring keeps juice from leaking from where the T-tip connects to the atomizer. When you put them on they snap in place because of the o-ring. They don't have a juice chamber like carts do or filling for the juice. They are used just for direct dripping. The hole on the mouth piece goes straight to the atomizer bridge, so it is kind of like a metal straw. You drip in the mouth piece and since there is no cart you get a more direct hit. The width of the hole is the perfect size for the juice to drip directly onto the atomizer bridge, so there is no more looking into the atomizer and aiming for the bridge while direct dripping. The down side to the hole being the perfect size to hit the atomizer bridge is the juice can kinda settle in the hole. After you drip three drops if you look into the hole you can see the juice "floating" there. This is solved by doing a very little and short blow into the hole. If you blow too hard your atomizer will leak. If you forget to blow you will get juiced but you don't get juiced with these as much as you do with carts. It may sound like since it is just a metal straw to the atomizer that the juice would leak out the mouth piece when not in use. This is not so. I have never had juice leak out of the hole. The only way it could leak is if it is upside down for a while. It solves the problem of melting carts and since it is metal it absorbs some of the heat. It absorbing some of the heat it a good thing. It give this nice warm feeling to your lips. The part that you put against your lips is rounded, so you don't feel sharp edges like you do with round carts but instead it feels like you are kissing tiny lips. I only own the brass ones right now. They make every e-cig I own look better. They make my eGo look like a bottle of champagne. B.E.A.utiful! They don't keep that golden shine for long. They start getting that dirty dark look of pennies but still look nicer than carts. The stainless steel ones might not have that problem. I hope this helps. Anyway, how they help with dripping and driving is there is no more removing and putting on your cart to drip. It makes the process faster and easier. I pull up to a light, put my e-cig between my legs, drip three drops, do a little short blow, and then vape. These things are so awesome that any direct dripper that doesn't have one must enjoy doing things the hard way and be a masochist. Here is the review that sold me: T-Tip brass mouthpieces

Schizo, that has to be one of the best explanations ever. You're my hero for today brother.

Ann, This is clearly personal choice, there is no right or wrong. Whatever works for you will be okay, heck some people still use polyester batting from the fabric store, some use tea bags, coffee filters, etc. Any Fluval (except charcoal) will work. As in my over 1 year of using various items I feel I have tried pretty much every suggestion and settled on any Fluval that my local store carries, just pack it the way you need to as you will know if it holds enough juice and draws the way you want it to. All the above fillers seem to work -- just each one performs differently, again whatever works for you is a personal preference.