Measures 64 x 89mm, and fits most of the standard card games including Magic: the Gathering, Pokemon, Flesh and Blood, etc.
Fits inside all standard sleeves (KMC Hyper Matte, Dragon Shield, Ultra Pro, etc.) to create a nearly airtight seal or one can just use it as a normal sleeve so no need to double sleeve as well.
Great especially for protecting foil/holo cards from warping/curling due to high/low humidity environments.