These High precision quality blades are of manufacture ,and are not manufactured by or affiliated with for .Head replacement recommended annually blade After installation, place a tiny drop of baby oil on each screen and allow to run for 10 seconds. These steps help to a properly-running . HQ69xx, 69xx, AT620 (Shaver series 1000) and also compatible with for models: 31DB, 6423, 6613, 6424LC, 6843, 6853, 6863, 6900 series High Quality Dual layers cutters with Fine steel blades hq3 Compatible withREPLACES HQ4, HQ4 Plus, HQ55, and HQ55 Plus, HQ56 Fits for Models: 6948XL, 6947XL, 6945XL, 6940LC, 6900LC, 6863XL, 6856XL, 6854XL, 6853XL, 6844XL, 6843XL, 6618X, 6617X, 6616X, 6615X, 6614X, 6613X, 6424LC, 6423LC, HP1318, HP1319, HP1327, HP1323, HP1327D, HP1328, HP1328E, HP1337C, HP1601, HP1602, HP1604, HP1605, HP1606, HP1608, 700RL, 705RL, 710RL, 715RL, 720RL, 725RL, 750RL, 800RX, 805RX, 815RX, 825RX, 835R Colour:As Shown Material:Metal Package Contents: 3 x Shaver Head 1 x brush 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.