1. Compatible with 3 series 30B models: 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. 2. Durable Materials: Made from high-quality materials for consistent, efficient, and user-friendly performance. 3. Optimal Shaving: For best results, replace the shaving head every 18 months. Over time, performance may decline after trimming over 6 million hairs. 4. Advanced Processing: The replacement head features precision technology for enhanced comfort and skin contact. 5. Improved Performance: Regular head replacement ensures long-lasting shaving quality and maintains device efficiency. Color: As pictured Material: Plastic + Metal Package Includes: 2 x shaving accessories (Other items not included.) Note: Slight color variations may occur due to lighting and screen differences. Size tolerance: +/- 1-3cm.