Well if you insist! The only way to celebrate a birthday is with cake followed by more cake and cake and cake…. Details: Designed by Badger & Burke. Size A6 (105 x 148mm / 4.1 x 5.8 inches). - that fits as a standard sized letter in the UK mail. Produced from sustainable forests and/or recycled materials. Blank inside for your own message. 100% recycled brown kraft envelope supplied. Made in the UK.