You can replace the shaving heads in minutes. Place a small drop of oil on each head and perform the shaver for 10 seconds after installation to ensure the shaver works properly and smoothly. Compatible with Remington Balder Pro Hair Shaver (XR7000/XR1500/XR1501),* Not compatible with XR1600/RX7/ BOSS XR7120 and XR7100 shavers The round head design perfectly protects the skin from scratches. You can enjoy a safe and smooth shave without scratching. Keep your razor performing super well. It is recommended to replace the shaving heads every twelve months