4
impossible to tell without a frame of reference. + is that the furthest back you can push the posts?
but tbh just go to a local piercing shop and ask if they can help you downsize. it’s usually free u just pay for the jewelry
OG post is if I do it gently this is full force (without pain)
can’t tell for sure but 8mm or 10mm, they also sell in between sizes (7 or 9 mm) if neither fit perfectly