Wahl Dynaflex Sensitive Flex Foil Heads Black Fits all Wahl Dynaflex 4000 series. Fits Wahl electric shaver models 4500, 4000, 3500, 7053, 7054, 7355, 7359, 7352, 7353, 7354, 7356, 7357, 7358, 7367, 7386, 7387, 7388, etc.