220mm x 220mm Mailer Gummed High Window White 100gsm Envelopes (Qty 500)These 220mm x 220mm Mailer Gummed High Window White 100gsm Envelopes (Qty 500) are designed to offer both functionality and a polished look for your mailing needs. Made from 100gsm white paper, these envelopes are sturdy and suitable for a range of documents and materials. The high window placement allows for easy visibility of important information or addresses, streamlining the mailing process. The gummed flap ensures a secure and reliable seal,