It features alternating long and short links, with slight carbon rivets and fibers. They appear many different designs along with. These boxes can be available in different dimensions for instance 7"(L) x 5"(W) x 3"(H). For the crown, positioned at 2 for the sky map and sidereal hour, at 4 http://153.126.169.73/question2answer/index.php?qa=user&qa_1=clientclass72