Articulating papers

Our articulating papers are in 3 sizes: in 30-50-100 microns thicknesses. They are blue or red. In one item there is only one color: each sheet is double sided and one-colored.One film's useful length is 9 cm.In one 30 micron and 50 micron book there are 40 sheets, but in the 100 micron book there are only 20 sheets.