Income Tax Return Envelopes for Customers, 9" x 12" Catalog (Open End), 100 Envelopes Made of Heavy 28lb. White or Brown Kraft Paper, Envelopes can be customizable with your company name, simply run them through any Laser or Inkjet printer or Print Your Company info on 2" x 4" labels and adhere into the Prepare by Cell. Envelopes can be used for any Tax Year. Deep Gum Flap with Strong Adhesive, Made in USA