These high-precision replacement shaver heads are designed for use with Philips Norelco models. Head replacement is recommended annually for optimal performance. After installation, apply a small drop of oil to each screen and run the razor for 10 seconds to ensure smooth operation.Compatible with HQ69xx, 69xx, AT620 (Shaver Series 1000), and also fits Philips Norelco models: 31DB, 6423, 6613, 6424LC, 6843, 6853, 6863, 6900 series.High-quality dual-layer cutters made from fine steel. Compatible with and replaces HQ4, HQ4 Plus, HQ55, HQ55 Plus, 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: Light reflection and different display settings may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.