120 film, 6x9cm, 8 exposures.
The Wista 4x5 roll film backs attach to the camera instead of to the 4x5 back without groundglass. The roll film back is built onto a 4-3/4 x 6-1-/4" (120 x 157mm) plate.
International Standard Roll Film Backs (1036, 1037) for 4x5 field cameras are used when the groundglass is not removed. The roll film back is built onto a 4-3/4 x 6-1/4" (120x157mm) plate and slides into the place of a cut film holder.