High Quality 120 gsm paper.Dark blue opaque for enhanced security of mail.Made using the whitest recycled paper available on the market.Secure Peel and Seal Closure for ease of use, added security and extra shelf life. For business correspondance, letters, brochures and more\r\n Power-seal peel & seal for extended shelf life and tamper proof sealing.\r\n Attractive dark blue opaque for enhanced security.\r\n