DL Black Gusset String & Washer Envelopes (Qty 100) 220mm x 110mm x 25mm1 2 day delivery as standard on this product These black DL gusset string & washer envelopes are designed to fit 1 3 folded A4 paper. The 25mm gusset means they can fit bulkier mailings. Made from high quality 180gsm paper. The string and washer closure is not only quite cool and retro, it also means you can re use re seal the envelope, making them good for the planet too! The string & washer envelope has practical uses, such as internal business