A versatile range of eight sizes across thirty-eight products for all bulky postal applications. Amongst this extensive range you will find tear resistant, recycled, coloured as well as the unique board back gusset setting apart the Blake range from all others on the market.. Features. Media weight. 140 g/m². Window. No. Product colour. White. Envelope format (ISO 269). C4 (229 x 324 mm). General. Product family. Purely. Product series. Packaging
