vape trick os

Hey, I was wondering which mods (The sticks not boxes) they're using to get those thick Os in some of those "vape trick" videos. I assume they're using an RDA tank but I'm thinking about getting the Wismec Predator 228 and was wondering if it would be just as good. for some thick clouds and...

Hey so i dont know if this is a thing but i figured out if i shoot Os a certain way threw eachother i can create a star let me now if u heard of this or can do it