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Tyvek Mailing Envelopes

Tyvek is a Spunbonded olefin manufactured by DuPont. The process produces an opaque sheet that is lightweight, yet extremely strong. Tyvek resists water, bursting and tearing.
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Tyvek Catalog Kwik-Tak (9 x 12) 5400 9 x 12 Open End Envelopes, 14lb Tyvek, Bright White, 100/BX (W5400)

9 x 12, 14lb, Bright White, 100/Box

Price: $56.00
#W5410 Catalog Envelope with First Class Border 9 x 12 Open End Envelopes, 14lb Tyvek, Bright White, First Class, 100/BX

9 x 12 , Box/100

Price: $58.00