An airbomb is a firework. It is simply a concentration of flashpowder in a paper case. This is ejected into the air with a black-powder lifting charge, ignited by a fuse. The flashpowder explodes in midair with a loud "bang" and a bright white flash. Single tube airbombs are classed as a cheap, nuisance firework. Multishot airbombs are legal. The airbomb effect, a loud bang and flash, continues to be a part of many larger fireworks. Since 1 April 2008, any firework which contains at least one tube containing over 5% flashpowder will be classed under United Nations regulations as 1.3G, with stricter transportation and storage regulation. This effectively means that any firework containing a flashpowder effect will not be legally available for sale after this date. As such, manufacturers are replacing the "bang" with a crackle effect, or are using black-powder bursts. However these are more expensive and don't have the traditional "flash" effect. AIRBOMBS or SOUND SHELLS are small tube items that are designed to be stuck in the ground. When ignited it will eject a tracer star up to 20 meters where it will explode with a loud bang and this is legal fireworks.