Sufficient to Apply: the package includes 100 pieces of clasp envelopes, the sufficient quantity can provide you with an ideal solution for storing and organizing various types of documents with ease Appropriate Size: the 9 x 12 inches dimension makes these colored envelopes spacious enough to securely hold multiple sheets of letter sized paper or other important materials without crumpling or folding Reliable and Long Lasting: made with kraft paper and metal clasp, these red envelopes are sturdy and reliable, tear resistant and long lasting, providing extra security for your important documents, and can stand for your long term usage Practical Sealing Mechanism: the metal clasps together with moisture activated gluing provide a secure grip and make the 9 x12'' envelope easy to open and close repeatedly without damaging the content inside; The sealing mechanism ensures your documents stay safe and protected during handling Wide Range of Applications: these mailing envelopes are versatile and suitable for various purposes, such as filing documents, mailing letters, storing invoices, photos, and other personal or business related materials