Quality Park, Clasp Envelopes, Gummed, Executive Gray, 10x13, 100 per box (38597) DOUBLE SEAL DESIGN -double prong metal clasps with reinforced eyelets and heavily gummed flaps ensure the envelope stays closed and durability SECURE: Clasp closure plus gummed closure for reliability, security and ease of mind that your contents will securely stay closed in the envelope REUSABLE-Great value, each box comes with 100 10x15 clasp envelopes that can be reused multiple times for a bargain VERSATILE: Get these executive gray envelopes in various sizes, depending on your needs. MULTI-PURPOSE: Use these executive gray envelopes as office envelopes, interoffice envelopes, storage of documents, etc.