Wonderful bars for little money

I bought the bar because I wanted my Citroen C4 Coupe visually improve.
The strips have fitted exactly, see also visually very good and stick bombproof.
Unfortunately, I did not know what extent have the sill before buying, so who in
these strips are interested in the extent:

Size: 485 mm x 38 mm -> Very thin material

The bars are made of aluminum and stainless steel no!
Remain How long stick the strips remains to be seen.