This is an item of stationery (paper or writing goods), or other small merchandise such as good-luck charms, mascot straps, et cetera.
Tomoe from "Queen's Blade" is ready to protect your car from evildoers! Stick this 12cm-diameter magnet to your vehicle (or your desk, or anything else made of metal that won't be damaged by a magnet) for a colorful dash of anime style. Limited quantities!