> For the complete documentation index, see [llms.txt](https://docs.cypherock.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cypherock.com/getting-started/best-practices-in-keeping-your-x1-cards-secure/use-the-protective-card-sleeves.md).
# Use the protective card sleeves
Card Sleeve for X1 Cards
Cypherock provides RFID covers for all your cards in the product packaging itself. The main aim of these Protective Card Sleeves is to create a faraday cage - an enclosure designed to block electromagnetic fields which prevent any unauthorized remote scanning of your X1 Cards.
It is recommended to always keep your X1 Cards in these sleeves, especially if you manually opted out from creating a PIN for your wallet account. Keeping Cards without PIN and Card Sleeves can lead to unauthorized access to your X1 Cards.
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