I read other people's reviews and noted that they also had same issued that I had.  The nylon coating was chipped from the cone side of the bottom and the egg shell like coating pieces were in my breads.  Then, later I found that those pieces were from the hook.  Therefore, I threw the hook away two times. Then, I bought a burnished beater and it has another problem.  Now, I need to find another beater and the hook which won't have any problem that I had before.  Otherwise, I need to buy multiple hooks/beaters to exchange every time to find grey gunk or chips?