notebook description:
KM13
cover size:15.4X15.4CM):128G art paper 4C+ 2MM grey board ,100G wood free paper;
inner sheet size:(14.8X14.8CM) 80G wood free paper ,80 sheets;
KM14
cover size:(10X21.8CM):128G art paper 4C+ 2MM grey board ,100G wood free paper;
inner sheet size:(9.5X21.3CM) 80G wood free paper ,80 sheets;
KM15
cover size:((13.2X20.4CM) 128G art paper4C+ 2MM,80G 1C;
inner sheet size:(12.4X19.9CM):80G1C,110;