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 Construction: Made from premium materials for smooth, efficient, and long-lasting use. 3. Optimal Shaving Performance: For best results, replace the shaving head every 18 months. Over time, trimming performance may decline after cutting over 6 million hairs. 4. Precision Engineering: The replacement head features advanced processing for enhanced shaver texture. 5. Maintain Performance: Regular replacement restores shaving efficiency and ensures a close, comfortable shave for years. Color: As pictured Material: Plastic and 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.