The tejo must be thrown from within the throwing area, and the goal is to impact the inside of the target at the other extreme. A chief characteristic of the sport is its use of small, exploding targets that contain gunpowder, commonly known as "mechas". These usually triangle-shaped envelopes with explosive material inside are set on the edges of the pipe where on impact with the tejo explode loudly creating a sound similar to the one created by a small revolver upon firing.