10 x 15 Brown open end clasp envelopes are perfect for sending important items such as wedding invitations, sensitive documents, and others. These envelopes come with metal clasps as well as gummed sealing. The combination of metal clasps and gummed sealing deliver an uncompromised seal. 10 x 15 Brown open end clasp envelopes are made using 28 lbs brown Kraft paper. This high-fiber paper is much stronger and more resilient than regular 24 lbs stock paper. The reinforced durability of these envelopes makes them ideal for sending heavy and thick stacks of documents, photographs, and crucial reports. These blank envelopes have a simple style and the metal clasps add a sense of gravitas.