Ironlak Attack was created using 12 hand cut stencils and Ironlak brand spraypaint. Each of the 20 prints in the edition have unique can top colors and unique art being tagged on the bottom of the Cans. You can see some samples of the variations in the prints here http://www.iansprints.com/ironlak-attack.php Each print comes signed, numbered, embossed and with a Certificate of Authenticity.