These high quality pre-cut decals stick over the top of the lower thin chrome grille strips (not the grey upper strips) in order to 'de-chrome' them. 
 
The procedure is fairly easy and can be carried out in around 10-15 minutes without removing the grille from the car.
 
Detailed instructions included.
 
Sold as a pair - left & right.
 
Upper grey grille overlay strips sold separately.