So annoying to have lost such a small but essential component of a swiss ball, so I was pleased that I could replace it quickly and cheaply rather than having to traipse around shops or simply give-up and replace the whole swiss ball. So nothing wasted on this occasion.
This is the second plug stopper I have purchased as I lost one during a house move. It is without doubt one of the most practical, handy products on the market. Everyone who owns a gym ball should buy a couple of these stoppers. Great value for money.