Bought a flat back post from this online store and took it to my piercer to help me put it in (I had just broken one of my wrists so couldn't get it in myself). She held it up next to several other posts of the same gauge (16ga), and this one was noticeably thinner than the rest, which was concerning in terms of quality control. When held up to 18ga posts, it was still thicker, so I guess it was some mystery 17ga post. I let customer service know this and they explained that I had probably been sent the wrong gauge, and that they would send me the same one again. I said I just wanted a refund as I don't trust that the new one would be accurate in terms of thickness, and they said sure but I would be charged a 20% restocking fee. I argued that it was their quality control that was the issue, so I shouldn't really have to pay for their issue, and they obliged saying they'd waive it the one time. When returning my item, I included this email exchange in the package so that they couldn't say they didn't know. When they received my return, I emailed back with my concern that they deducted a restocking fee (they didn't, it was my miscalculation) and they just had to sneak in there that they measured the jewelry and it was in fact 16ga. If you scroll through the reviews, you'll see that I'm not the first person to have this problem with their QC. If you're not concerned about quality control at all and want to deal with a retailer that always has to get the last laugh, please do buy from here!