Clear, poly windows. Inside tint for privacy of contents. Wove finish offers durability to ensure your letters arrive undamaged and in 1 piece. Fully gummed seal makes a secure and reliable closure with ease. Inside tint for privacy of contents. Compatible with most standard 8 1/2 x 11 computer-generated invoices and statements. Double viewing windows positioned on left side of envelope front. Bright white color is great for both formal business letters and personal correspondences. Seam Type: Side. Side seam construction offers a smooth, fold-free back panel. Security tint protects sensitive information on documents within the envelope. Finish: Wove. No matter your exact mailing requirements, this Universal #9 business envelope is sure to fit the need. Great for sending business correspondences, invoices and bills, or personal memos, this Universal UNV36301 #9 3 7/8" x 8 7/8" white security business envelope with double windows with fully gummed seal is the solution your office or business needs to keep on top of its day to day communications. Featuring a 24# basis weight and white color with security tint, this envelope is both sturdy and professional looking to make sure it arrives to its destination in one piece while still looking presentable. The convenient fully gummed seal makes closing and securing the envelope quick and easy, while the double viewing windows allow names and addresses on articles inside of the envelope to be easily seen once sealed. Plus, the #9 size allows the envelope to fit inside of a standard #10 envelope for sending notices that require a response.