The one of many reasons to have children and sharing this tip with fellow parents will have them remembering why they had their little offspring. Details: Designed by: Chris Simpson. 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 yellow envelope supplied. Made in the UK.