 The combination of air and flammable fuel in the pipe's enclosed space when ignited by a spark from the trigger mechanism or by small fire causes the fuel-air mixture to combust, resulting in a loud, booming sound.The first prototype is made from segmented tin cans connected with packaging tapes or electrical tapes and cut PET bottles (which is still used) and later design is made of PVC pipes.Other modifications of boga are introduced such as firing round projectiles which can be used as a weapon and pet bottles as breech end.