The Quality Park DuPont Tyvek 12″ x 15 1/2″ 100 Envelopes are high-quality and durable self-adhesive envelopes perfect for packing and shipping. Made by Quality Park Products in the United States, these envelopes feature a strong DuPont Tyvek construction, ensuring they can withstand rough handling during transport. With a unit quantity of 100, these white envelopes provide a secure and reliable option for sending documents, products, or other items via mail or courier.