For use on any silver, black, red, blue and dark gray Dynaflex models. Wahl recommends changing the foil every 6 months for a closer, more comfortable shave. Fits all custom shave, Dynaflex models including 3500, 4000, 4400, 4500, 7035, 7053, 7054, 7352, 7353, 7354, 7355, 7356, 7357, 7358, 7359, 7367, 7386, 7387, 7388. Actual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product.