Do you know a dude? Is it their birthday? If you do, then look no further, you've already found the perfect card.
Details:

Size: A6 (105 x 148mm / 4.1 x 5.8 inches).
Printed on FSC Board - this means that the paper is produced from sustainable forests and/or recycled materials.
Blank inside for your own message.
Includes a brightly coloured envelope.
Made in the UK.