Suitable for 3 series 30B: 310, 330, 340, 199, 197s-1, 195s-1, 199s-1, 4735, 4736, 4737, 4745, 4775, 4835, 4845, 4875, 4876, 5713, 5714, 5491, 5492, 5493, 5494, 5743, 5745, 5742, 7475, 7493, 7497, 7504, 7505, 7510, 7511, 7514, 7515, 7516, 7520, 7526, 7540, 7546, 7564, 7570, 7630, 7640, 7650, 7664, 7680, 7690, 7763, 7765, 7783, 7785, 7790. High-Quality Materials: Made of high-quality materials for continuous, efficient, and easy-to-use performance. Shaving Performance: For optimal shaving results, we recommend replacing the shaving head every 18 months. After 18 months of use, the electric shaver may have trimmed over 6 million hairs, which can gradually reduce cutting performance. Special Processing Technology: The replacement head features advanced processing technology that enhances the overall performance of your shaver. Restore Performance: Replacing the head helps restore your shaver’s performance and provides a better shaving experience. Regular replacement helps maintain the shaver in excellent condition for years. Color: As shown Material: Plastic + Metal Package Contents: 2 x Shaving Accessories Note: Light and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.