This shaving head's 4 outer blades have a different blade pattern design than the original. 

• New hinge design to clean blades easier.
• New blade design for working through thicker hair textures.
• To replace the head, pop the old one out and pop the new one in. Do not twist. . 

Please note:

• This blade will be more aggressive with its cutting approach.
• If you have finer hair, you may not need this blade.
• If you have a sensitive head, be sure to use shaving cream and water with this head.

1. Replace Every 3 Months!
2. Clean shaver during and after every use to extend the blade life.
3. Subscribing to the Shaver Head subscription plan, will give you a nice discount and also extend the warranty on your shaver.