All WHITE Boxes are: Brown on the inside and PLAIN WHITE on the outside
All Brown Boxes are: Brown on the both inside and outside
Size Dimensions: A4/C4: External Size: 345mmm x 240mm x 22mm (13.6" x 9.5" x 0.8") - Qualifies for Royal Mail Large Letter
Size Dimensions A5/C5: External Size: 230mm x 165mm x 22mm (9" x 6.5" x 0.8") Qualifies for Royal Mail Large Letter
Size Dimensions A6/C6: External Size: 160mm x 115mm x 22mm (6.3" x 4.5" x 0.8") - Qualifies for Royal Mail Large Letter
These boxes are very easy to construct and are designed with fold over ends and earlock lids. High quality boxes which are made for the Royal Mail postal system.