It used to be coated with something (I don't remember what, but I've had a few of these attachments and the coating does wear off), and when that happens, I have always replaced them instantly. If stuff comes off the attachment when touching it, it will probably also come off in the food - and I don't want to eat whatever it is.
You can get new attachments made of stainless steel (I've seen both the old coated aluminum and new stainless steel attachments sold individually on Amazon) and they are really nice. I haven't used them in an old Kenwood, but I was told by the Kenwood customer services that they would fit my old Major.
