What is the full inflation size of the p.ball? Naomi O. January 17, 2020 08:00 Updated Follow The full inflation size of the P.ball is 19.5" - 20.5" in circumference. Related articles What is the p.band? What is the p.ball? Do the gliders work on carpeted floors? How can I cast workouts to my TV from the P.volve iOS app? How is P.volve different from Barre? Comments 0 comments Article is closed for comments.