1.2 is just a standard piercing i think. 1.6 obviously wont make much of a difference, i went from standard to 3.5mm within the 2nd week of having it pierced, now im on 8mm after a month and 1 week of having it pierced. EDIT: I'm on about ears btw, not lips, but its kinda the same, if your wanting to stretch your lips use steel or glass, not plastic or silicone.