Mylar Stencil Sheets A3, 100-pack. Sheets of thin transparent mylar plastic for making your own stencils. Mylar plastic is very durable yet thin enough to easily cut out shapes or letters for airbrushing and brush painting. Works equally well for cutting with a scalpel or with a plotter printer. Thickness: 125 microns (µm) / 0.125 millimeters (mm)