The bottom of the bowl where the blade is, is metal for about 1/2" to 3/4" in the deepest part in the center. Above that it is white plastic and the smoky colored plastic cap fits down into this area while grinding. My new grinder has no chipping, and my old Krups grinder, (same design, purchased and used since the mid '80's!) has only one tiny bit of chipping on the very edge of the plastic cap. But it was used daily grinding coffee beans. My old grinder has held up over those 30 years better than I have. LOL! The cap on my old grinder did not cloud up over time.