To make sure the jiffy bag gives a light and airy sound, it is important to only use nylon cord to hand the jiffy bag. In the past experiments have been carried out with helium in an attempt to lighten the sound further. However, these experiments were abandoned when it was discovered that jiffy bags were impossible to hit after rising to a height of 15ft. To avoid excessive spinning it advisable to use an A5 jiffy rather than A4.