00 Slate or Tile Roof Strips, pre-cut, 0.6mm White Card, Laser Cut.
Laser cut from 0.6mm white card.
10 strips 200mm long x 12mm.
Just slit the tabs that hold each strip in place, no need to cut.
More realistic than flat sheets.
Just overlay each strip.
The ones in the image have been sprayed with grey primer.
They can be spayed with grey or red acrylics.