Quality Park #10 Antimicrobial Window Envelopes, Redi-Strip, White Wove, 4.125 x 9.5, 500 per Box, (90119) DURABLE: Made from 24 lb. white wove stock REDI-STRIP: No moisture required with this Redi-Strip closure LESS YUCK: We promise you won't miss licking envelopes or crumbly, drippy sponges; complete your mailings, no accessories required SECURE: Protect sensitive client information with these security tinted envelopes. The reflect blue tint pattern makes it impossible to see the details of the contents, even when held up to the light GREAT VALUE: Conveniently packed in 500 count to reduce the frequency of repurchasing