High quality paper 28.7 lbs (135 kg) (4 times higher than the thickness of the most popular copy paper. Paper thickness is 182μm, 85.5% whitness, 98% opacity. Color/Monochrome copier, compatible with SRA3 size (450 x 320 mm) and can only be used with laser printers. Paper is affected by moisture. When stored for a long time, please be careful to manage the humidity of the environment.