Professional cards' durability is one reason why they are used as identification cards by government entities and large companies. The stainless steel plate prevents the professional card from bending or warping because it is flexible enough to bend instead of breaking like other types of plastic. It also makes the card more resistant to water, chemicals, and other elements.Smart Card Purchase Platform The plates are also thin enough that they do not interfere with wearables such as wristbands or rings; however, durable plastics can be used for this purpose too.