The 3 color cards are plastic and resemble the material, thickness and bending properties of an EC or credit card. They are also just as strong and just as great. They are dull and feel slightly velvety. All 3 have a small hole in the corner, through which one - if you will - can thread the supplied wrist strap. So you have always all together 3. I have the color card always in the camera bag with it. At first I was skeptical because of the small size, but it actually makes no difference whether you use large or small color cards. I can at least see no. Who wants to see with the help of these cards generated videos can visit my YouTube channel. Simply enter in the YouTube search "Maxico manuals and tutorials." All Videos from 2015 were created using the map.