These sleeves are used to 'double sleeve' cards for added protection.
KMC Perfect Size Inner Sleeves Review
KMC 100 Card Barrier Perfect Size (20 Packs/Total 2000) : Toys & Games
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)
64x89mm 100 Pieces KMC Card Sleeves Protector Game Trading Cards Standard Perfect Size Transparent Double Sleevs For MTG/PKM/FAB
KMC Std. Sleeves - Perfect Size Sleeves [10 pk] $34
KMC Perfect Size Inner Sleeves
400 Pcs Ultra Clear Perfect Fit Sleeves for MTG, Perfect Inner Sleeves for Double Sleeving, Soft Penny Sleeve Snug Fit Baseball Sports Card Sleeves 64x89mm : Toys & Games
KMC Perfect Size Perfect Fits Pro-Fit Card Sleeves Guard Protector
KMC Perfect Fit Sleeves (1 pack of 100 pieces) for Pokemon, MTG, Hobbies & Toys, Toys & Games on Carousell
KMC 100 Card Barrier PERFECT SIZE Newest Version (10 packs/Total 1000) : Toys & Games
New Clear Card Sleeves Standard Sized Game MTG Top Loading 64x89mm Card Film Transparent Clear Pokemon Card Sleeve 100 Pieces - AliExpress
KMC Perfect Size Inner Sleeves Review
Thin, Clear sleeve that fits inside all KMC Standard sleeves. Top loading. 89mm x 64mm in size. Thickness .05mm. Pack contains 100 sleeves.
KMC Perfect Fit Sleeves
KMC Sleeves KMC Perfect Size Inner Sleeves €“ Mini Size 100 Sleeves Per Pack - 2 Packs : Toys & Games