What is the difference between single flare and double flare in gauges?

Question

in gauges[ears] whats is the difference, and if you try to put in a double into a single will it hurt?

Answer 1

The gauge is the same for both singe and double flared. Single flare is obviously easier to get in because you don't have to try fit the extra 1-2mm of the flare through your stretched lobe.

It's not advisable to try insert a double flared plug/tunnel into a freshly stretched piercing, rather let it settle for at least a month to get used to the new size. Most people find the easiest way to do it is have a hot shower or bath to soften the skin and then massage the lobe with a lotion or oil like emu oil or similar, then when inserting the double flared jewlery lever it in like a button, one edge first, then the other.

Be gentle and don't rush it. If you are really struggling, try stretching to the next size for a while so it's easy to get the double flare in.

Answer 2

A double flare is one where the tube is bent back over itself created a stronger, crack-resistant flare.

It's better than a single.  As long as the flare/nut angles are the same it'll be fine.