Pair doesn't turn center but other pair turns right. I'm not sure what could have caused this, but didn't realize my experiment failed before using it as it was made sterile so I couldn't open the container to change them. Buying cheap stirrers cost me 5x because of a failed experiment. My mistake. Otherwise, the other pair works fine. I only suggest that you test them before relying on them. It's a silly mistake on my part not to test them, so I'm giving them 3 stars.
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