15 x 12 x 10" Corrugated Boxes. Quality standard strength industrial Corrugated Boxes. Makes a fast, economical file storage box. Flaps fold in for easy hanging. Legal/Letter sized to hold 15" of letter size files or 12' of legal size files. Boxes are manufactured from 200#/ECT-32 kraft corrugated. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping. Proudly made in the USA