Great for business and commercial use, these Office Impressions #10 Business Envelopes come in 24-lb white wove paper, giving your correspondence a clean, professional look. The gummed flap provides a secure seal, and the 4.13" x 9.5" size is extremely versatile, great for mailing paychecks, personal mail, business mail, promotional materials and much more! Seam Type: Diagonal; Flap Type: Commercial; Trade Size: #10; Security Tinted: No.