The ProStage II range of professional Stage Gerbs are identified by the burn time (first number) x the height in feet (second number). For example: a 1/4 x 20 is a gerb of 1/4 of a second duration that reaches a height of 20ft. Heights are also given in metres (the height of a gerb is defined as the height to the top of the main plume, some sparks will go higher).
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