These are PTFE coated magnetic stirrers. You're doing a pretty good job. I would highly recommend them if you are doing something where you need it. Inexpensive and definitely good quality. Mine had such a GOOD thick coating that one of them fell down the garbage chute and made an awful noise when I turned it on. After extraction I saw a fairly severe cut on the coating but not complete. I use mine to eat, so one is in the trash (better safe than sorry), but if you're doing something else it would probably still work fine after it was in the chute (that loud thing in your sink that bangs and drops food it'll go you down the drain if you're reading this from somewhere you don't use the same term.) Would buy again.
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