Bouncy balls are great but do you know what makes them better if they flash when they bounce create your own tremendous sense of bouncy satisfaction with this amazing craft kit that lets you make a pair of light up bouncy balls simply place the flashing core into a mould then fill with the colourful powders included with the kit when the mould is full just drop it into water and wait a few minutes you39ll have an amazing flashing bouncy call in no time at all