Lux Mailers. The product is a case containing 100 white 7″ x 9″ cardboard photo mailers with self-seal tear tabs. Manufactured by PackagingSuppliesByMail, these shipping envelopes are ideal for securely sending photos, documents, or other items through the mail. The self-seal tear tab ensures easy and secure closure while the sturdy cardboard construction offers protection for the contents during shipping. Perfect for businesses or individuals looking for reliable and high-quality mailing supplies.