Nylon Air bladder is covered with fire retardant fabric

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Use them for business and personal mailing needs

Each envelope in this set features a light blue marbled color that will give your mail a beautiful and calming appearance

Deluxe Double Window Form Compatible Envelopes, 9" x 4-1/8", 500 Pack (W771-500) personal_care_l3_first_aid_baby_personal_care_l2_health_safety_l1|en_CA Nylon Air bladder is coveredMake doing business more efficient with Double Window Confidential Self Seal Envelopes. No addressing needed! Just fold, insert materials and mail. The double window design clearly shows return and destination addresses.