Standard Proofing Paper Roll Swop3, 9 Mil, 24" X 100 Ft, Semi-Matte White Semi-matte surface finish and neutral tint base. Engineered to meet the requirements of a true SWOP3 application perfectly. Coated with exacting standards, this paper displays outstanding performance and stability. Its medium weight combined with a wide color gamut makes this the perfect choice for commercial proofing. Delivers outstanding accuracy and stability, and has been officially certified in the SWOP3 category by IDEAAlliance®.