Card sleeve

Card sleeves (Japanese: カードプロテクター Kādopurotekutā "Card protector"; Korean: 카드 실드 Kadeu Sildeu "Card shield") are protective plastic covers used to prevent cards from getting bent or scratched. Most card sleeves are made by third-party manufacturers, though Konami distributes a few styles of their own sleeves.

If a player uses card sleeves, they must all be the same so their cards aren't marked.

In the OCG, it is possible for a player's Deck to contain cards with different backings. In cases like this, it is mandatory for the player to use sleeves to prevent their cards from being marked.

In video games, card sleeves serve no practical purpose and only serve as customizable features.

Summer Go! Go! Carnival
These card sleeves were only available during the "Summer Go! Go! Carnival" promotion campaign that was celebrated on 2014.
 * If you buy 5 packs of The New Challengers between July 19 and August 8, you will receive 5 card sleeves of 1 type of the following 3.

Volume 1 Limited Edition Sleeves

 * Starting from October 11, 2014, for every 5 Booster SP: Tribe Force packs purchased, the purchaser will also receive 1 "booster pack" containing 5 sleeves of 1 of the above random designs.

Volume 2 Limited Edition Sleeves

 * Starting from November 15, 2014, for every 5 The Secret of Evolution packs purchased, the purchaser will also receive 1 "booster pack" containing 5 sleeves of 1 of the above random designs (including Volume 1 designs).

2014 Recipients

 * Singapore Qualifier: Top 50 players from the Swiss Rounds + Top 8 from Ranking Tournament 2013 (the latter group being seeded into the top 32 of the Qualifier)
 * Malaysia Qualifier: Top 32 players (out of a total of 64 participants qualified for the tournament, the top 32 being the winners of the first round of matches)