Hmm, haven't thought of that, they do rub off over time, as I used them on my D-lock to identify which one belong to which keys.
Our D-locks and their keys are identified by thin differently coloured cable ties. I think the 'selection box' came from LiDL or Aldi.
@edscoble started
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Hmm, haven't thought of that, they do rub off over time, as I used them on my D-lock to identify which one belong to which keys.