SH50/52 Heads Sharp Replacement Knife for 5000 Series S5370/84, 5000 Series S5370/81, AT790/40 Trickey Shavers, 5000 Series S5660/84, 5000 Series S5590/81, 5000 Series S5290/88, 5000 Series S5210/81,AquaTouch-AT8xx, AT7xx, PowerTouch-PT8xx, PT7xx.Reset to New: Replace the Shaver Heads for 12 months to reset the shaver to one for better useConvenient: SH50 Shaver Heads Replacement with 9 Blade Heads, just like the original heads, you are super comfortable and shaveEasy replacement: carefully remove the old shaving heads, then insert the replacement; Check that the heads are exactly aligned in the setting. When the head shaving properly, you will hear it clickMaterial: MetalColor: SilverPackage Content:6*Shaver HeadOnly the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm.