What is the difference between U-45PN/U-450JP and B-45PN/B-450JP ?

U-45PN/U-450JP are open type in which the film is placed outside the unit.
It is a standard model with easy film setting.

B-45PN/B-450JP are box type, in which the film is placed inside the unit.
This type is designed to prevent dust from getting on the film.
The machine is recommended for use in smaller spaces because of its shorter depth compared to U-45PN/U-450JP.

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■Product details
Hand Wrappers
https://asahi-packaging.com/genre/hand-wrapper/