AppleRound Exercise Ball with Pump, 9-Inch Small for Pilates, Yoga, Core Stability - Choose: [Pack of 1 Ball + 1 Pump] or [Pack of 2 Balls + 1 Pump]

This was certainly a good purchase 4-me . The quality & the size is just right 4-my excerise purpose. The air retention & the functionality is fantastic.. The color was my preference.The ball comes with a pump & plugs so that the air won't dissapate. I found this 2-b a great value 4-my money.

Inflates nicely to around 7.5 inches in diameter. This a a great size for my purposes. The turquoise color is prettier in person than on the site. BTW: I had to go back to the online description to realize that I had to remove a white insert before it would inflate. It comes with no inflation instructions; just be sure to take this step, and you will be golden!

Very thin pop easy

It was easy to inflate

I love the ball it is really good for my PT and it's almost the same as what my person has it's very durable The size is just right and it's going to be great for me

This ball won't hold air because there's no mechanism to stop the air from escaping while you put the stopper in, even if you're very fast. Not sure how anyone could possibly use this ball. The only way to fill it up is to hold the stopper in your mouth, but far back enough that you can still blow, and then push the stopper in with your tongue. And then it still won't be fully inflated. It's ridiculous.

They are well made at a reasonable price. They do exactly what they're supposed to. They even come with a pump. I'd buy these again. I don't think I'll need to because these will last a long time.

I bought two sets for a class. One set blew up to the correct size. The other (2 balls) were smaller. Around 6-7 inches. I tried adding more air, but they did not go any further in size.