why doesn't the instruction tell a child/parent how to divide this long tube into 10 pieces of what seems like 5 shorter and 5 longer bandages....and also isn't the tube narrower than the pre-cut 'bandage' 30888712?
and I assume (descriptions in german/french) D 3 8 x 0060 means 3.8mm x 60mm
but is the spanish description wrongly taken from fire fighting sets as "MADEJA BOMBERO 10 CM" if its at all 10cm and not 60mm?
I don't have this set, cheng, but I am sure I have seen similar rubbery tubing which is narrower than the hard plastic bandages and can be pushed onto legs to act as extra bandages. Maybe look at the vet sets? Is the tubing partly pre-cut? The picture in the instructions seems to suggest you can pull it apart (there is no scissors-symbol for example). If it isn't pre-cut, my guess would be that you make random lengths.
I think you are correct in thinking D 3.8 x 0060 does refer to the dimensions in mm, that seems to be the case with other parts listed on playmobil websites, so the Spanish description probably is wrong (many errors in pictures or descriptions appear on Playmobil's parts finder).