High precision quality manufactured replacement heads. Recommended to replace annually. After installation, apply a small drop of oil on each screen and allow the device to run for 10 seconds. These steps help ensure proper operation. Compatible with HQ69xx, 69xx, AT620 (Shaver Series 1000) and models: 31DB, 6423, 6613, 6424LC, 6843, 6853, 6863, 6900 series. High quality dual layer cutters made with fine steel (hq3). Replaces HQ4, HQ4 Plus, HQ55, HQ55 Plus, HQ56. Fits 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. Color: As shown Material: Metal Package Contents: 3 x Shaver Head, 1 x Brush Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause slight color variation between the item and the image. Measurement may vary by +/- 1-3 cm.