Quality Park, #10 Security Tinted Envelopes, Redi-Strip, Windowless, White, 4.125x9.5, 500 per box (69122) PERFECT FIT: Our #10 envelopes effortlessly fit standard 8.5x11 sheets of paper and documents SELF-SEAL: Long gone are the struggles of licking envelopes or using moistener pens. Avoid the hassle with the self-sealing Redi-Strip closure PROFESSIONAL FINISH: Bright white wove paper makes for a fresh, clean appearance perfect for any use MULTI-PURPOSE: The plain envelopes have the ability to have custom labels printed on or even have addresses handwritten. These plain envelopes have no windows providing more security to contents inside BARGAIN: Each box comes with 500 #10 Envelopes that are the go-to choice for everyday plain envelopes in offices.