Nipple Piercing

So I want to get new jewelry for my piercings but I’m unsure of what size to get. What is the average length and diameter of a starter nipple piercing and what size are the balls normally? I’m looking to get something that ideally has smaller balls but isn’t short and too close to the nipple . The piercings tend to aggravate my nipples on the sides. I found this pic online but am unsure which sizes etc go to which one. I think the third or second one from the right is what I’m looking for.