What are the differences between EVANS Hydraulic Heads?

All EVANS hydraulic drumheads feature two plies of film, with a thin layer of oil in between. They come in four colors, which have different ply thicknesses as follows: 

 

Black 6.5mil + 7.5mil 

Red 7mil + 7mil 

Blue 7mil + 7mil 

Clear 6.5mil + 6.5mil 

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