Full height sides keep materials from slipping out. Great for taking files out of the office. Reinforced tabs for frequently used files. Thumb cut for easy access of documents. Back tab is 1/2" higher than front for indexing. Made From 11 point manila stock. Expands 2" and holds up to 250 sheets of paper. Made in the USA. Smead is a certified woman-owned company by the Woman's Business Enterprise National Council (WBENC).