Forum:Yu-Gi-Oh! Bandai OCG Series: Shields ?

I saw a wikia gallery for the Bandai Yu-Gi-!Oh OCG Series: Shields and was wondering what exactly I was looking at, they didn't appear to be cards. Are they collector tins or something else? I'm very curious as to what they are the art work was very nice and they look to be something worth tracking down for my collection. If anyone has any info on these items that would help in finding them on ebay or some other shopping site please post, any info would be appreciated. Thanks.