Essentials: Slimline Envelope2 piece die set intended for slimline papercrafting basics. Create a custom envelope for any standard slimline card sized up to 4 x 9. Boxes & packs of slimline sized envelopes can take up a lot of space in your craft area and can be quite an investment to get a collection of colors & designs. Now you can create your own gorgeous envelopes from colored cardstock, patterned papers, vellum & more! Finished Envelope Measurement: 4. 25 x 9. 25