The lamp strip smoothly fits between the body and the matching parts of the fender. 
It reduces the gap between the body and the lamp and prevents the noise caused by the gap while the car is running. 
This product can be easily seen when the car hood is opened, so it should work in clean form without burr or flash.
Also, since it must be attached to the lamp, the rubber surface must be pretreated with a primer to improve the adhesion of the double-sided adhesive tape. In general, EPDM rubber is used, and it should be excellent in water resistance and ozone resistance.