Do you mean the black impact strip or the bumper cover?
The impact strips are black, but the bumper covers need to be painted to match the color of your car.
The parts are available at the dealer, here at PartsShop, and a ton of other places.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".