Tudor C5 Envelope Gold This Tudor C5 Gold Envelope comes in a handy pack of 500 so that you can stock up at once. Each envelope has a side loading feature which makes it ideal for folded letters, cheques and more. This envelope has adhesive on the flap which makes it easy to press and seal. Tudor C5 Envelopes 500 Pack Each Tudor C5 Envelope is plain faced so you can write freely on the front or affix address labels for a more professional look. They are side opening and have a pocket style so you can easily slide your folded mail inside. Stock up on envelopes with this handy pack of 500.