Yo! So I've tried just about every brand of cartridge there is out here in southern california and This cartridge is the absolute best! The air flow is miles ahead of anything else that's out and it burns for a super smooth and clean hit. Fits 510 thread but if you can i recommend picking up the DIME battery. The size if the cartridge itself is probably one of the bigger ones in the market but after testing it's drop resistance soon came to find that it's pretty durable for its size but i still would be careful carrying it in your pockets if you're using it with a 510 thread battery.