Interesting photo on Shotgun world of the item made by advance sport. The one I saw was similar in thinking but had wider space between the rows with writing on the space either machined in or stamped. They were anodized red or blue. Very cool looking. I think they were a bit different but I could be wrong.
That is similar to the shell holder in the photo posted by Advsporttech.com within the above link posted by ninjak is what I was referring to, only the one I had, did not have the two extra shell holders. The link with the photo appears to have a empty shell container as part of the frame. Mine was just a plastic frame that the shell holders clipped onto.