This Ruler is a perfect way to begin to Memorize the Books of the Bible. Once upon a time, I knew the Books by Memory. However, I was a child back then. In Sunday School I learned the Books of the Bible. And in my 8th Grade History class I memorized the Names and Proper Order of The Presidents of the USA. So this is a perfect way for a Sunday School Teacher or a Home Schooling MOM to teach her child/children the Books of the Bible. I Highly Recommend this Clear Ruler as a part of Bible Study. I would give this Item a 15 on a Scale of 1 to 10 where 10 is highest. This small clear Ruler is OFF THE CHART AS Utmost in EXCELLENCE!