360 Degrees shaving experience: our replacement heads for shavers are equipped with 360 degrees design, which can care about most dead ends, the head is in round shape, can gently shave, not scratch your face or remove the unwanted parts, efficient and have good effects Easy to install: these shaver heads are convenient to install for replacement, after installation process, you can place a tiny drop of oil on each head and run for 10 seconds to maintain a properly-running function; It's recommended that you should replace the shaving heads every 12 months for nice performance Compatible with for Series 5000 S5370/81, ATric shaver AT790/40, Series 3000 PT730/41, Series 4000 AT810/41, Series 5000 S5660/84, Series 5000 S5590/81, Series 5000 S5290/88, Series 5000 S5210/81. Color: As Shown Material: Steel Package Contents: 6 x SH50 Replacement Head Blade Only 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.