In The Metal Edge Of The Car Body Between The Car Door And Car Body. In The External Edge Of The Car Door Easy to Install: This door guard strip designed to fit easily Protect the value of your car, the edge molding is UV protected for longer life, effectively avoid the paint off the door Can be fitted to doors,boots,grills,bumpers,interior,exterior, etc. Advantages: Helps prevent nicks, chips, clash or scratches. It's also a good sound insulation when someone close the door very strongly