11mm x 11mm Impression size Loyalty Card stamps improve customer loyalty and help attract new business Simply email us after checkout with your requirements of your stamp colour (Black, Blue, Red, Green or Violet) and we will do the rest. If you wish to use your own image or logo, then simply attach an image file to the email. Please note that any images/logo's used must be line art designs To email us, go to the Amazon 'Your Account' feature in the top right, select 'Your Orders', then simply click the button 'Contact Selle Please remember to send your requirements as soon as possible in order that we can begin the manufacture of your own unique and personalised stamp