Value for money!!

This is Archie's Bob the Builder balloon I bought him at the Zweibeln Markt a week last Friday ago!! It cost ?3.50, which I thought at the time was quite a bit for a balloon but when I compared it to the prices of Jade rides and games it really wasn't that much in the big scheme of things, so we got it him!

A week and a half on, the very same balloon is still stuck to the ceiling! It's flagging a bit but still there and I'm very impressed! I've had these balloons many a time that have only lasted a couple of days or so... is there different types of hellium or is it luck of the draw???