Two, the film isn't properly taped to the backing paper. Usually only a tiny strip of masking tape can be found there. Often carelessly placed, and holds the film only at the centre part of its tip's width. This poses a problem in cameras where the film runs in a back loop like in Hasselblad, Kiev-88 or Mamiya. Because the ends of the film-end tips are loose, they can catch on some part of the film magazine and jam or wreck the film, if not the magazine. This always happened to Shanghai and Lucky film I load in Kiev 88 cameras. The loose film tips can also catch in a Rollei's sensing fingers.
They are suitable to use for Seagull, Yashica, and any TLR or folder with auto-film stop. Those using redfilm windows at the back won't be fun to use with Shanghai or Lucky films.