MIDORI Brass Series - Stationary marks the trace of time. This collection contains pencil case, ruler, pen, and pencil all made by the Japanese craftsmen beside the bookmark. Brass, a component of copper and zinc, is good for precision instruments, ship parts, music instruments, and bullet shells due to its great mechanical and wear proof properties. MIDORI Brass Series is a great choice for users who love the trace of history, since the color of brass changed after years of usage, leaving a unique shine. We sugguest picky user to shop in store since all copper products will have scratches on it when released from the factory.