The AAX is arguably one of the brands most popular series and its
  easy to see why. A highly playable surface and a bright, crisp
  sound makes the AAX range a perfect choice for pop and metal
  drummers alike. No matter the genre or musical scenario, the AAX
  will thrive. This is in part due to the use of B20 in their
  construction – the most commonly used type of bronze - which
  leads to an extremely wide frequency range.