 This article is about a transformation item in Kamen Rider Den-O.
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Zeronos Cards (ゼロノスカード, Zeronosu Kādo) are a transformation card item used by Yuto Sakurai, also known as Kamen Rider Zeronos. These cards allow him to access his different forms. Unlike the Rider Pass, each Zeronos Card has a limited number of times it can be used. Once a Zeronos Card's energy is depleted, it dissolves upon removal from the belt.
The Zeronos Cards are made from the memories of Yuto's existence. Thus, if they're completely exhausted, Yuto risks ceasing to exist in the minds of people who are not Singularity Points. He later receives a set of red Zeronos Cards from his future self that use his own memories to change into Zero Form.
In Kamen Rider Den-O: I'm Born!, Yuto demonstrated that Zeronos cards can be used in place of a Rider Pass to traverse time by inserting them into the Rider Pass slot of his Machine ZeroHorn.