Columbian CO805 9x12-Inch Tyvek White Envelopes, 100 Count Envelope designed for ultimate protection. Protect what's inside. Superior moisture, burst and tear resistant protection. Convenient and secure self-sealing Grip-Seal closure. Simply peel off release strip and press down for a quick, secure seal. First Class border ensures priority attention. Lightweight white Tyvek material. Open end closure. 9" x 12" 100 envelopes