Although very large, the balls have enough squish to push into your arse with relative ease. I have so far managed 4 and the sensation when you pull them out is mad! My wife likes to push them into me then yank them out in one go. We are working to the full six but that’s a ways off. Don’t lube the balls. Lube yourself then push them in. It’s easier as they do need a bit of force. We use an applicator to lube me inside then shove them in. They go a long way and stretch you wide open, if you like stretch you will love these! The connecting string is nice and thick and feels really nice hanging out of you as well.