Transformation gerbs change in the middle- a 10 Second Transformation gerb will burn 5 seconds with gold sparks, and the last 5 seconds with silver sparks. Gerbs with color refer to the color of the flare at the base of the spark column. Crackle gerbs produce a 4' to 6' plume of fuzzy gold sparks and a LOT of noise. See the crackle gerb for more information. Droopy gerbs produce a non-definite plume that reaches approximately 5 feet vertical, then droops over. Sparks will hit the ground when fired like a normal gerb. These gerbs are primarily used by parachute teams and other aerialists. Standard lead length for included match is 36".