For more info visit bit.ly eplacement blade for Braun models 7505, 7526, 7546, 7570A replacement foil and cutter block, the two pieces fit Braun Syncro shaver models 7505, 7526, 7546, and 7570. These shavers need a new foil and cutter block every 12 to 18 months, depending on toughness of beard and frequency of use. Braun Syncro shavers are noted for their four-way moving head that captures and cuts more hair in fewer strokes. The pivoting head oscillates from side to side, and large foil holes capture more hairs. For more info visit bit.ly www.homepermanenthairremovalproducts.info