Daweier Anti-Burst & Slip Resistant Exercise Ball Professional Grade Color Green Diameter 55cm

Yeah, mine burst. Granted, my son abused it a little, and I did not measure it regularly to see if it was over-inflated. But it popped. It's ok, you can laugh.

Gave this as a gift in April 2017. Just heard that it was smaller than the 55cms and too low to use at desk.

Great ball

very good ！