The product is a set of 500 poly mailers shipping envelopes, each measuring 14″ x 17″ with a thickness of 2.5 MIL. These self-sealing bags are made of durable polyethylene material, offering reliable closure options such as self-seal, gummed, and peel and seal. With various exterior sizes available, this product is ideal for businesses and individuals looking for efficient and secure packaging solutions for their shipping needs. Originating from China, these poly mailers are a practical choice for handling and transporting items in a professional manner.