Portrait; single-sided Primary: 0.186- 0.189 mm Secondary: 0.2240 0.234 mm Tertiary:0.286- 0.289 mm All support are machine made. The primary and secondary supports are of artist quality. The primary support is tan/light orange in color, with a textured surface. The secondary support is maroon in color, and heavier than the primary support, but has the same texture. The tertiary support is black, elephant skin paper and a shiny/waxy finish; internally dyed.