most of the sheets I saw were made of brass..if you use any kind of cardboard or poster board it should be single ply .I cut stencils for my projects many years believe it or not most of my stencils are cut from fruit loop or apple jack boxes..yes this is great stuff that cuts nice with nice edges,does not bleed .im making some stencils now for sing along..i cut these stencils myself for this monster gun..yes this one easy but same technique used for larger projects.after I finish with stencils I sometimes hang up.DSC00295.JPGDSC00291.JPGDSC00294.JPGDSC00691.JPG