C5 Grey String & Washer Envelopes (Qty 100) 162mm x 229mm1 2 day delivery as standard on this product These grey string & washer envelopes are C5 size 229mm x 162mm, so fits A5 size paper or half folded A4. Made from high quality 180gsm paper. The string and washer fasten 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 makes a unique impression for marketing and advertising packs, and something a bit