Why are the white brushes 1.-- more expensive than the black ones? Can't be, can it? They do the same thing and, as I understand it, the white colour should be cheaper to produce than the black. How come?

CHF 103 for four? Four packets for four or is the dynamic system going haywire?

I have the black one (unfortunately long delivery time for the brush heads). Do the white ones also have a circle / triangle to distinguish the brush heads?

Are there colour markings on the attachment brushes so that family members can recognise theirs?

Are they soft toothbrushes?