Low Quality
For years we've been buying the brand name heads.  Without exception the bristles wore out before the mechanism.  All four of these generic brand arrived broken, or broke while in use within one week.  Sometimes you DO get what you pay for.  I would stick with the name brand replacement heads.  We did not request a refund in this case for such a low dollar amount, we did not consider it the sellers fault.  We just thought it was a good lesson learned.
Rating: 1 stars