The Royal Mail PIP Large Letter Boxes C5 by Boxomatic are sturdy postal boxes made from cardboard, measuring 20mm in height, 218mm in width, and 159mm in depth. Perfect for securely packaging and shipping large letters or small parcels, these boxes provide reliable protection for your items during transit. Making them ideal for individual use or for businesses requiring a large volume of shipping materials. Trust in these large letter boxes to ensure the safe delivery of your packages.