#9 Regular Security Tinted Envelopes -Self Sealing 3-7/8x8-7/8-Inch White Envelopes- Peel And Seal Return Business Envelopes (100/Box) #9 envelopes are the ideal size for 8 1/2" x 11" paper as well as voucher computer checks. #9 envelopes also fit inside of #10 envelopes, making them suitable for enclosure as a return envelope. # 9 security tinted envelopes white 24lb measures (3 7/8" x 8 7/8"). No moisture is required to seal and one simply needs to peel off the strip before sealing the envelope. Tear off strip also keeps adhesive from dust and thus giving it long shelf life. To seal these individuals simply need to remove the strip and press little bit hard to make it seal. 100/box