Columbian #10 Security Tinted Envelopes, Grip-Seal, 4-1/8" x 9-1/2", White, 250 Per Box (CO148) Security tinted #10 envelopes; premium 24 lb. white wove stock; 4-1/8 x 9-1/2 Inches; 250 envelopes per box Convenient and secure self-sealing Grip-Seal closure; simply peel off release strip and press down for a quick, secure seal Envelope is ideal for all business, professional and personal correspondence; security tinted for added privacy and confidentiality; made in USA