The boxes are manufactured in London by Barrow & Gale. Covered in red-stained rams' leather, they are embossed with the Royal Cypher and ministerial title. The 2–3-kilogram (4–7 lb) boxes are constructed of slow-grown pine, lined with lead and black satin and, unlike a briefcase, the lock is on the bottom, opposite the hinges and the handle, to guarantee that the box is locked before being carried.[2]