Revar Cine RC-RT4565138CP Rota-Tray 4x5.65/138mm with Circular Polarizer Rotating Filter Tray, Black Filter Tray with rotating motion for 4x5.65 size Matte Boxes Compatible with Arri, Chrosziel, Bright Tangerine, and other 4x5.65 Top Loading Matte Boxes Not compatible with Red Rock Micro, Tilta, or Arri MB-20