It is a relatively soft inner sleeve(These can be bent or folded if no card is inserted). These sleeves fits inside other standard size sleeves (91mm
KMC Perfect Fit Trading Card Soft Sleeve Standard Size 100×30 Set
5 Set!!! /// KMC Card Barrier Sleeve Perfect Hard from
KMC Perfect Hard Sleeves Are Stupid!
Gamegenic Soft Sleeves (Standard) 100 ct
KMC Perfect Size Perfect Fits Pro-Fit Card Sleeves
KMC Sleeve Perfect Fit - Standard Size Perfect Black - Ace Cards
KMC Perfect Size Card Sleeves Mini [10 Packs] : : Toys & Games
TCGplayer: Shop Card Sleeves Cards, Packs, Booster Boxes
KMC Clear Perfect Fit Top Load Inner Sleeves (100-Pack) - KMC Card
10 Packs Dragon Shield Sealable Inner Sleeve Clear Standard Size
Sleeves
1 Pack/Lot 80 Sleeves/Pack Contains 1 pack of 80 deck protectors. Deck protectors are 91 mm x 66 mm. Hyper Matte sleeves are created using a special
KMC Hyper Matte Sleeves, 80-Pack, Black
KMC Standard