1. High-quality materials, continuous, efficient and easy to use. 2. Suitable for: S1000 S3000 S4000 S5000 S500 XZ5800 XZ580 SW175 series 3. The shaving head should be replaced every 18 months. 4. Changing the shaving head can increase the shaving effect by 25%. For best performance, clean regularly. 5. Replace the head to restore your shaver to 100% performance High quality and durable. Easy to install. Sealed container. Name: Razor Blade Replacement for Color: Silver Material: Stainless Steel Package Contents: 18 x Razor Blades Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.