Portrait; single-sided Primary: 0.306- 0.308 mm Secondary: 0.284- 0.296 mm Both supports are machine made. The primary support is internally dyed orange in color with red and blue mixed fibers. Clumped fibers are visible in transmitted light, with a textured surface. The primary support is thicker than the secondary support but with less sizing (softer). The secondary support is a brown, support; high degree of fillers (opaque in transmitted light). The felt side of support is facing up. Same secondary support as 0227.140, 0227.190.