422. Sleeves

422.1. Players may use plastic sleeves or other protective devices on their cards.
422.2. If a player chooses to do this, all such sleeves must be identical and all cards in a deck must be placed in sleeves in the same manner. Cards in decks must have the same number of layers and be the same orientation at all times.
422.3. Sleeves must have opaque backs.
422.4. During a match, a player may request that a judge inspect an opponent’s sleeves.
422.5. Judges may disallow any specific sleeve or the sleeves generally if they believe they are marked, worn, inappropriate, offensive, or otherwise interfere with shuffling or play.
422.6. At high OPL, sleeves must also not: