China Bг¶ller Pyro Cracker -

A gray "Chinese Fuse" is the classic ignition method, though modern variants may use more consistent visco fuses.

In the standard hierarchy, Pyro Crackers are smaller than "A-Böller," "B-Böller," "D-Böller," and the massive "Super-Böller". China BГ¶ller Pyro Cracker

Multiple layers of stiff paper (often red) rolled into a tight tube. A gray "Chinese Fuse" is the classic ignition

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 Pyro Crackers are smaller than "A-Böller