These improvised instruments are made of plastic, are approximately one meter long and require a lot of lung strength for a loud noise to be produced. The noise is similar to the one produced by an elephant.
Unfortunately vuvuzelas caused a lot of trouble since 2001, when the South African company began to mass produce them.
Doctors attracted attention to the risks that might appear when surrounded by a crowd of fans blowing the noisy instruments.The main risk is permanent or temporary hearing loss so that wearing a pair of ear plugs is a good ideea when attending a World Cup 2010 game.
Other important health risks involve spreading airborne germs or other diseases, when sharing the same vuvuzela with other supporters.