310mm x 238mm Mailer Gummed High Window White 100gsm Envelopes (Qty 250)These 310mm x 238mm Mailer Gummed High Window White 100gsm Envelopes (Qty 250) are ideal for professional and efficient mailing. Made from high quality 100gsm white paper, these envelopes offer durability and a polished look. The high window design allows for easy visibility of important information or addresses, enhancing the convenience of your mailing process. The gummed flap ensures a secure seal, keeping your contents safe during transit. Perfect