There are many large and small notebooks in the market including practical office notebook, student exercise notebook, gift notebook etc.Many companies want to print notebooks with their own company logo, with a choice of size and cover, but it's not clear which one is right for them. Pls find the summary of the notebook size as below:
16K Leather cover size(270*210mm) Inside paper size(258*188mm)
24K Leather cover size(235*175mm) Inside paper size(210*190mm)
32K Leather cover size(218*154mm) Inside paper size(208*144mm)
48K Leather cover size(187*122mm) Inside paper size(170*97mm)
56K Leather cover size(145*105mm) Inside paper size(128*83mm)
For the leather cover, it can be in common PU Leather, color changed PU or genuine leather. It depends on your budget and choice.

