The Duck 500 Count Security Packing List Envelopes with 5″ x 4″ inside dimensions are a product manufactured by Duck in the United States. These security envelopes are designed to protect important documents and items during shipping and delivery. With a total of 500 envelopes included in the pack, they provide a secure and reliable way to send sensitive information. The brand’s reputation for quality and durability ensures that these packing list envelopes will effectively safeguard your valuables.