These high-precision replacement shaver heads are manufactured to meet quality standards and are not produced by or affiliated with Philips Norelco. Head replacement is recommended annually for optimal performance. After installing the new blades, apply a small drop of oil to each screen and run the razor for 10 seconds to ensure smooth operation. Compatible with models: HQ69xx, 69xx, AT620 (Shaver Series 1000), 31DB, 6423, 6613, 6424LC, 6843, 6853, 6863, and 6900 series. Features high-quality dual-layer cutters made of fine steel. This set replaces HQ4, HQ4 Plus, HQ55, HQ55 Plus, and HQ56. Fits Norelco 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 Cleaning Brush Note: Only the items listed above are included. Light reflection and differences in display screens may cause slight variations in color between the product image and the actual item. Measurement error allowance is +/- 1-3 cm.