you get what you pay for [SEP] yes they fit the sonicare and are the same size as the previously available compact brushes but they do not have the same cleaning ability they are too soft and the bristles really do not seem very effective if you are like me and need a smaller toothbrush head you are probably trying to replace the awesome compact heads philips soniscare used to offer but these just do not cut it i will use these for now until i can find a true replacement but will not buy again