These sleeves are used to 'double sleeve' cards for added protection.
KMC Sleeves KMC Perfect Size Inner Sleeves €“ Mini Size 100 Sleeves Per Pack - 2 Packs : Toys & Games
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KMC Black Fit Inner Sleeves Matte Standard Size 64mmx89mm for sale online
Vault X Exact Fit Trading Card Sleeves - High Clarity Perfect Fit Inner Sleeves to Protect and Preserve Board Game, Collectible and Trading Card Games (100 Pack) : Toys & Games
KMC Soft Sleeves Card Protectors, Perfect Size - 100 count
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KMC 100 Karte Barriere Perfekte Größe (10 Packungen/Gesamt 1000) : Home & Kitchen
It protects a card from huskiness and a dirt and moisture. It is made exactly (89 mm 64 mm) with card size. Protective ability power is strengthened with using together with KMC card barrier series.
KMC 100 Card Barrier Perfect Size (10 Packs/total 1000)
KMC 100 Card Barrier Perfect Size (20 Packs/Total 2000) : Toys & Games