This is a copy of our most popular "Precious Blood of Jesus Daily Devotional." It is 4" x 6" with "prison approved binding." It has a paper cover, not heavy card stock and no wire binding, just glue. There are three holes punched down the left side so the inmate can tie a string through the holes to help hold the book together. Some high-security facilities will not allow the string, so we do not include it. This has been approved by most high-security facilities for their inmates.