Printing Children Board Books Printing ItemChildren paperboard book ,Coloring Book printing,children books SizeA3(420*297mm), A4(210*285mm),A5(148*210mm),A6(105*148mm), or on your requestedInner MaterialsArt/coated paper:80gsm,100gsm,127gsm,157gsmOffset paper/wooden free paper:50gsm,60gsm,70gsm,70gsm,85gsm,100gsm,120gsm.Kraft..