Feature: Install the converter on the 135 roll film canister, you can use 135 film in the 120 camera to take wide format pictures (As I showed in the picture). And take twice as many pictures as the original 120 film. Compatible with: 120 Medium Format Camera, such as Pentax, Rolleiflex, Mamiya, Hasselblad, Makina, Bronica，etc... Material: Plastic (Plastic material will not damage the camera) Package: 2pcs empty film rolls and 4pcs/2 pairs converters. (Film and film back are not included).