Haha, this product is exactly what the package says... One of those times where you didn't want this to happen. I got the 45cm ball with the misguided impression that it would fully inflate to something larger like 50-55cm or so (approximately chair height). But no, this damned ball inflated and maxed out to pretty much at 45cm! Just because I have another brand 55cm ball which inflates to near 65cm and found that one too large. So, in summary, if you want a reasonably hard stability ball what inflates to 45cm, then this one is for you.
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