plain 510 atty - for use with 510 cartridges
mega 510 atty - for use with 510 mega cartridges
510-T atty - for use with 510-T
tanks
The first two may come in different resistances (ohms) and 2.5 to 3.0 should be OK on slim batteries. Any lower is for the fat batteries like Ego/Riva 510 and for mods. Lower is hotter and uses battery charge faster
The first two, with manual batteries only, can be used with a drip tip
On an Ego, I think the Ego mega atty is much fatter too and need an Ego drip tip
Most people use cartomizers for their favorite juices so you may end up using the atomizers when you start out and for testing juices and
vaping your occasional juices.