These boxes are compliant with the new royal mail 'small parcel' guidelines effective 1 April 2013, and subsequently updated in October 2014, hence carry a reduced rate of postage in the royal mail system, as they qualify as small parcels. A pallet of 1800 x Size 12x9x4" A4 Single Wall Packing Cardboard Boxes. Perfect for small items, A4 documents, leaflets etc. Most commonly used in the printer industry as well as by on-line sellers for sending small products (eg nutritional products etc). These have an A4 size base (12x9") and are 4" high.