I have lots of things that I think will fit perfectly in my bellybutton, and I try them out one at a time to see how they fit. I have some nuts, that I can squish right into my tummy button and they stay nice and snug. Then I try some pearls, popping a little pearl into my navel and pushing it in so it's stuck. I have lots of things including a tiny fish toy who takes a dive in my belly button, and some jewels and gems that are a perfect fit in my navel! After I insert each item I give you a nice of close up view of it in my belly, some things are a tight fit and others get lost completely!