Because of their smaller powder weight, they produce a sharper, higher-pitched "crack" compared to the deep, bassy "thud" of larger D-Böllers. Modern Classifications and Safety
In Europe, these usually fall under Category F2 (adult fireworks with a safety distance of at least 8 meters). Specialized versions, like those from manufacturers like Funke Fireworks , may be categorized as P1 sound generators , requiring a 20-meter safety distance due to higher pressure effects. China Böller Pyro Cracker
The "Pyro Cracker" is the smallest common size in the China-Böller family. Because of their smaller powder weight, they produce
Modern regulations strictly limit the explosive content (often 50mg to 130mg depending on local laws) to ensure they are safe for consumer use while still being effective. History of Fireworks - American Pyrotechnics Association The "Pyro Cracker" is the smallest common size
The ends are often plugged with clay (bentonite) or crimped paper to contain pressure, which creates the "bang" when it finally ruptures. The "Pyro Cracker" Variant
A gray "Chinese Fuse" is the classic ignition method, though modern variants may use more consistent visco fuses.