The new 12″ STRATUS Cirro Stax features a 12” top that is raw on
  the front and lathed on the back, which reduces tension and
  contributes to a loose, wavy, and flexible design. The 12” bottom
  is flat and raw. Pairing the two creates a structure that can be
  tightened to shorten attack or left loose for a sizzle effect.
  The 12” top can also be played alone to create a striking phaser
  sound.
  - 12” top with raw front and lathed back
  
 
  - 12” bottom is flat and raw
  
 
  - Played tight for short attack, or left loose for a sizzle
  effect
  
 
  - 12” top can be played alone