Here we provide the common size for notebook for your reference:

A3 - 420 x 297mm.

A4 - 297 x 210mm.

B5 - 250 x 176mm. 

A5 - 210 x 148mm. 

A6 - 148 x 105mm. 

For more information, please contact us via email: jack@oopackage.com or whatsapp/wechat.