A party popper is a handheld pyrotechnic device commonly used at parties. It emits a loud popping noise by means of a small friction-actuated explosive charge that is activated by pulling a string. The explosive charge comes from a very small amount of Armstrong's mixture (a highly sensitive explosive) in the neck of the bottle-like shape. In some party poppers, the explosive charge is replaced by compressed air. In party poppers with an explosive charge, there are less than 0.25 grains (0.016 g) of explosive. The streamers are non-flammable for safe use. The charge or compressed air blows out some confetti or streamers and emits a popping sound. The charge is often composed of red phosphorus and strong oxidizer, such as potassium chlorate and potassium perchlorate.