Sometimes known as follower blocks, these are manufactured from our 425# test Lig-Free corrugated board. They are cut using serrated knives to minimize sharp edges. They serve to provide support for the contents of partially-filled document cases, and are available in packages of five. Each bar features five score lines on each side, measures 8 in. high x 21 1/4 in. long, and fit in both letter and legal size boxes.