White Kraft Interoffice EnvelopeTreated with an antimicrobial agent to protect the envelope from the growth of bacteria, mold, mildew, fungus and odors. Security tinted for privacy of contents. Printed two sides with space for 52 entries. String-and-button closure. Envelope Size: 10 x 13; Envelope/Mailer Type: Interoffice; Closure: String and Button.