The Aimoh 500 Double Window Security Check Envelopes are designed for secure shipping and packaging. These self-seal envelopes feature a quick seal adhesive strip for easy closure. With a 500 ct. and dimensions of 3 5/8 x 8 11/16inches, designed to fit 8.5 x 3.5 checks, these envelopes are perfect for businesses and industrial use. The double window design allows for easy tracking of shipments, while the security features ensure the safety of your valuable items. Weighing 24pounds, these envelopes provide durability and reliability for your business security needs.