Portrait; single-sided Primary: 0.260- 0.269 mm Secondary: 0.295- 0.299 mm Tertiary: 0.284- 0.298 mm All of the supports are machine-made, and around the same weight. The primary support is a muddy grey/green, and has mixed fibers. The painting is located on the wire side of the support. The secondary support is a deep teal blue and a little softer than the primary support (less sizing).The black tertiary support is the softest of all, and is internally dyed.