Left Window Positioning: Window measures 1 1/8" x 4 1/2", positioned 7/8" from left and 1/2" from bottom, perfect for displaying pre-printed addresses Standard Business Size: #9 envelope dimensions of 3 7/8" x 8 7/8" accommodate most business correspondence, invoices, and billing documents Security Tint Protection: Interior security pattern keeps confidential information private and prevents contents from showing through the envelope Premium 24lb White Wove Paper: High-quality construction ensures durability, strength, and a professional appearance for all business mailings Gummed Flap Closure: Moisture-activated adhesive seal provides secure, reliable closure for protecting important documents during transit Made in the USA Upgrade your business mailings with #9 Business Envelopes with Left Window. Measuring 3 7/8" x 8 7/8", these envelopes are the perfect size for mailing checks, invoices, and statements. The left-side address window makes addressing quick and convenient, while the security-tinted interior ensures confidentiality for sensitive documents. Crafted from sturdy 24lb white wove paper, these envelopes deliver both strength and a professional appearance. Each envelope is equipped with a traditional gummed flap closure, activated by moisture for a strong and secure seal. Ideal for businesses, schools, and everyday office use, these envelopes provide a dependable solution for secure and professional correspondence.