You pull it out with anything you wish - 21g, etc.
It's very thin (the thinnest SEO) so it goes through anything, including 28g insulin pins.
Obviously use the smallest needle you can so you minimise scar tissue and inflamation, but use something that is long enough - 5/8" or 1". I know that you are a woman, so if you are lean enough, you can use 1/2" as well.