This is an item of stationery (paper or writing goods), or other small merchandise such as good-luck charms, mascot straps, et cetera.
Perky pink-haired Mitsurugi Asuka from the visual novel/erogame "Wizard Girl Ambitious" is all cute enthusiasm on this deskmat! Made of lightweight plasticized woven fabric, it measures 29.7cm (almost 11 3/4 inches) by 42cm (16 1/2 inches). Let her cast her spell on you!