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018 mm Polypropylene; Letter-size zip closure document envelope with business card/ID slot on front; Features 1 expandable gusset and zipper top closure to keep papers from falling out; Opens on long side; Holds approx 100-150 A4 and letter size sheets; Business card slot measures: 4w x 2.25h, and holds approx 3-5 business cards; Product Size: 13.25 w x 9.5 h x 1 d