How to choose yoga ball plug: Large yoga ball plug is suitable for exercise ball fitness ball plug replacement jumping horse handle ball etc. Small yoga ball plug is suitable for yoga ball plug replacement small Pilates ball gymnic ball children ball etc. If you are not sure which exercise ball plug is suitable for your exercise ball Buying a fitness ball plug replacement kit (Small and Large) is your best choice. You have three options: 1.Exercise Ball Plug Replacement kit (Small): 5 small exercise ball plugs 1 removers. 2.Exercise Ball Plug Replacement kit (Large): 5 large exercise ball plugs 1 removers. 3.Exercise Ball Plug Replacement kit (Small and Large): 5 large exercise ball plugs 5 small exercise ball plugs 2 removers 1 parts storage box. Warm Tips: Since the yoga ball plug is only a small part please keep it away from children or use it under the guidance of adults.