C6 Red String & Washer Envelopes (Qty 100) 114mm x 162mm1 2 day delivery as standard on this product These red string & washer envelopes are C6 size 162 x 114mm, so fits A6 size paper or half folded A5. Made from high quality 160gsm 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 is also a cute option