The wire whip that came with my beautiful new tilt head grape colored mixer is made of an aluminum body with stainless steel wires.  Haven't your engineers every heard of galvanic corrosion?  The aluminum will oxidize if you put this in contact with any conductive solution: Lemon juice, dishwasher soap, dish washing detergent, vinegar.  Bad engineering! The oxidation forms an icky black powder that covers everything and gets in the food in the mixer if it gets wet.  Eventually the wires will come out of the body as the corrosion continues.  I tried coating mine with clear nail polish, but then it wouldn't fit on the head anymore.  Make it all stainless. (This review was collected as part of a promotion.)