These quad grid books makes the layout of calculations & charts much easier. Made in New Zealandby an organization that is committed to maximizing post consumer recycled content. Manufactured from 100% recycled fiber, waste wood from harvesting and processing operations and/or virgin fiber from sustainably managed sources. Contain no carcinogenic, mutagenic, reprotoxic or ecotoxic dyes, pigments or coatings. This product does not contain any azo dies or pigments which release potentially carcinogenic amines making this a more environmentally friendly choice.