Lion File-N-Send Poly Inter-office Envelopes, 10 x 13 Inches, Opaque Charcoal Gray (Black), 6 EA/Pack, 1 Pack (22700-CG) 10" x 13" Hook and loop closure / Top loading / 1-1/6" gusset With Letter size outside pocket Preprinted interoffice routing slip included Overall dimension: 10"W x 13"H Recyclable polypropylene material Opaque Charcoal Gray (Black) 6ea per pack