#10 Regular Envelopes (4 1/8 x 9 1/2) in Mandarin are vibrant, bright orange colored envelopes perfect for mailing checks, invoices, letterhead, personal letters, statements, and direct mail. These top quality envelopes are sealed by a moistenable strip located on the inside of the back flap and are constructed from smooth, durable 80lb. Mandarin LuxPaper stock. #10 Regular Envelopes are available both plain and custom printed for company branding and creative uses, starting in small quantities of 50 to large quantities of 50,000 and more.