The metal book markers provide easy, convenient access to selections from the Bible. Simply place the spring, with the three attached metal stay bars, around the edge of the pages near the spine, with metal stay bars in the front, middle, and back of the book. Select the page you wish to mark and insert marker # 1, hooking the top end of the marker, and then the bottom. Proceed to the next citation. Custom made for studying the Christian Science Bible Lesson. In addition to the citation numbers 1-26, this set of markers also includes S (Scriptural) and C (correlative) and B (Benediction.) The markers are run down the height of the book in one row. These markers are custom sized to fit the Sterling Readers edition Bible.