UDM1641 Features: * Closure: String and Button * Envelope Size: 8 1/2 x 14 * Security Tinted: No * Format/Border: None * Post-Consumer Recycled Content Percent : 0 pct * Expansion: 1 1/4 inch * Pre-Consumer Recycled Content Percent : 0 pct * Window Size: 14 1/2 x 9 * Global Product Type: Envelopes/Mailers-Special Case * Window Position: Center * Weight : 32.00 lb * Exterior Material(s): Polypropylene * Envelope/Mailer Type: Special Case * Total Recycled Content Percent : 0 pct Includes: * Custom Imprint Included: No Color/Finish: * Color(s): Transparent Blue