The choices are endless to celebrate a birthday and this card by Kim Ku has made it nice and simple with four great birthdayoptions! Details: Designed by Kim Ku. 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 sources and/or recycled materials Blank inside for your own message. 100% recycled brown kraft envelope supplied. Made in the UK.