blackout card sleeves Exact Fit Black Keep your cards free of the wear and tear of battle Bushiroad Sleeve Collection Mini Vol.517:

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Thickness of 1 Side (microns): Dragon Shield Perfect Fit Sealable (75), Ultimate Guard Cortex Matte (105) 100 Double Sleeved Card Thickness (mm): Theoretical (66), Practical (71) Water Test: Pass Deck Box Fit (mm storage): Fit: 81 good, 19 bad

Once per turn (Quick Effect): You can send 1 card from your hand to the GY, then target 1 face-up card on the field

More than just placement, it guards your Field Spell against destruction and grants the ability to Xyz Summon during an opponent's turn, if they've just Special Summoned a monster