These heads seem almost the same as the Philips heads. They are made of plastic but don't have the metal ring inside the base. Apart from that, the bristles seem the same and have the "wear" line of bristles on them. I will wait to see how long they last, although the Philips heads show that they need changing long before 3 months use! The only thing to consider-if more than one person is using the Sonicare, these heads don't have the changeable colour code bands on them. They are just a fraction of the price of the Philips heads so I think they are well worth trying.