Portrait Primary: 0.221- 0.229 mm Secondary: 0.142- 0.148 mm Tertiary: 0.247- 0.252 mm All three supports are machine-made. The primary support is a dark, muted orange color, wove and smooth construction paper. The secondary support is slightly lighter tones orange construction paper and is thinner than the secondary. The tertiary support is a dark rust color, construction paper and is the thickest of all three supports.