Each ball needs 3 balloons and plain flower, superglue and a funnel.
Use a funnel or a wide necked juice bottle (less messy)
Blow up the ballon, twist neck 3-4 times
Put the funnel of flour or juice bottle into the neck of the balloon, untwist and fill with flour .
Let the air out the balloon, cut off the neck of the balloon with scissors, put to one side.
Cut the end off another balloon and stretch it over the flour balloon.
To ensure it never comes apart you can dab on some superglue on the undersides of balloon.
Cover each balloon with a minimum of 3 balloons but you can do more.
Cut two ends of a balloon and you get two sets of holes on the ball to make it look more interesting.