NDN LINE Ten Fitness Exercise Sport Yoga Ball Air Stopper | Replacement Plug Stem | Valve Pin Adapter Kit GREAT VALUE: The kit includes 10 plugs, 1 remover, 1 adapter plug COMPATIBILITY: Stopper works with Bosu Balance Trainer, Pilates Balls, isokinetic and Hop Balls, Gymnic and Gaiam PLUG REMOVER: Save your nails (and time!) with our ball plug remover ALL GYM BALL SIZES: NDN LINE's Valve Stem work in sizes 55cm, 65cm , 75cm and 85cm LOST PLUG? It happens! Get your Yoga Ball back at work with a new Air Stopper Plug Pin. Length 5.2 CM/2"