Wide Compatibility: 5000 replacement heads fit for Shaver 5000 series S5370/84, S5370/81, S5660/84, S5590/81, S5290/88, S5210/81, Shaver AT790/40.High Precision Cutting System: SH50 replacement heads has a precision cutting system. Round head design in order to protect your skin from scratching perfectly.The Latest Upgrade: Replacement heads 5000 series has an ultra-thin head, with slots for shaving the long beards, and holes for shaving the shortest stubble.Tips: After install the blades for series 5000 replacement heads, place a tiny drop of baby oil on each heads and allow shaver to run for 10 seconds. These steps will help to ensure your shaver running properly and more smooth.Package：You will get 3 pcs of SH50 for Series 5000 replacement heads.