?Shaving Effect?Rounded edges glide smoothly over skin for a protective shave. ?Double-layer Blade?The shaver heads replacement adopts a double-layer blade design, which is sharper than ordinary single blades, providing you with a more comfortable and efficient shaving experience. ?Sufficient Quantity?The double-layer blade replacement heads come in a total of 6, a set plus a cleaning brush. ?Note?Not suitable for pentagonal shaving heads and honeycomb series. Before using, please watch our installation video or other installation videos to ensure correct use. Then you can put a drop of baby oil on each head and let the shaver run for 10 seconds. ?Compatible Models?Compatible with s5xxx s6xxx series, AT8xx/AT7xx/PT7xx Series; Incompatible with Pentagonal cutter head.