At present, there are two kinds of magnetic strips on the market: cobalt-based magnetic strips and iron-based magnetic strips. The main component of cobalt-based magnetic stripe is metallic cobalt; The main component of iron-based magnetic stripe is pure iron. For example, according to whether it can be charged or demagnetized in use, it can be divided into composite magnetic strips and permanent magnetic strips. Generally, open-shelf stacks use composite magnetic strips; Because books in the reading room are not lent out, permanent magnetic stripes are used. From the price point of view, iron-based magnetic strips are about half cheaper than each cobalt-based magnetic strip.