They fit nicely on the Sonicare toothbrush
These fit really well and work just as the manufacturers toothbrush heads do.  They do not have the metal ring at the base of the brush, but I don't know that I miss that.<br />My complaint and why I am giving them 3 stars is that the bush head has larger individual brush pieces.  Instead of many smaller bristles these have larger channels of bristles.  I don't like it because with the smaller bristles they get between my teeth and get food out.  The bigger channels make that harder to do.
Rating: 3 stars