These studs/posts are the basic staple for your earring wardrobe.  They're great for everyday activities  [workouts, chores, errands, beach and/or swimming] when a bigger earring may be too much but you still want something simple and bright.  My only complaint when purchasing, I would have appreciated seeing the different earring sizes [mm's] on models to make sure I was ordering the size I wanted. Also don't look for fancy packaging.  As described you do get 16 pieces without individual packets/holders which to me is only an issue if you're finicky.  After receiving, I simply mounted the 16 pcs. [8 prs.] on an emery nail file block for easy view and storage.