I know we have discussed the disposable variety
But this was on THIS MORNING today and had me is fits of giggles as Dr Chris demonstrated it on a model.this morning
Apparently it is a good idea to give a little shake when finished!!otherwise as was demonstrated you will be left with a dribble
He said it would be useful for hand gliders and they stay up for hours at a time.
They come in variety of colours to co-ordinate with your outfit.
whizaway