Fussy cut windows are precision laser-cut from durable polyethylene. Their usefulness is only limited by your imagination. The window size is laser-etched clearly on each window. Use the fussy-cut windows to preview and mark your fabric for cutting. NOTE: Fussy Cut Window Frames DO NOT have no slip backing; only the templates are no slip. 4 piece set 2.5", 3.5", 4.5" and 5.5"