Dual Matte sleeves have a black interior layer built in, so unlike a clear sleeve, there's no way to see through to the card back, no glare, no shadow, nothing. That's specifically why tournament players lean on these: fully opaque backs remove any possibility (real or perceived) of card backs being distinguishable during shuffling. Matte textured exterior for the same smooth shuffle feel across our matte line. 100-count, standard size (63.5x88.9mm).