The Revar Cine Rota-Tray 4×5.65/138mm with Circular Polarizer is a geared filter tray designed and manufactured in the USA from aircraft grade aluminum and poly materials to interface with the latest 4×5.65 matte boxes on the market today. Commonly referred to as a RotaPola, RotoPola, or Rota-Pole, this geared tray allows for a use of a common 138mmm unmounted circular Polarizer in a rectangular 4×5.65 tray.