These are for cards that are 63.5 X 88 MM, like Magic The Gathering Cards. The size indicated in the picture is a design mistake. The cards measure 63.5 x 88 MM.
It comes with 80/pack and features a thick BLUE-backed card sleeve that is slightly textured and of a matte finish. They are perfectly clear and have no annoying circular logo in the corner to cover up text.
They also come in packs of 80, what most players say they prefer.