In the standard hierarchy, Pyro Crackers are smaller than "A-Böller," "B-Böller," "D-Böller," and the massive "Super-Böller".
In the late 20th century, these items were standardized for the European market. For instance, in Germany, "BAM" numbers (like BAM-PII-xxxx ) were used starting in the 1970s to certify their safety and performance. Technical Composition and Construction
A charge of Black Powder (typically a mixture of potassium nitrate, sulfur, and charcoal).