... qualities of offset paper:Grade A:Material: 100% virgin wood pulpWhiteness:100-102% whitenessGrammage: 55gsm, 60gsm, 70gsm,80gsm, ... per ream, wrapped by kraft paperGrade B:Material: 70% wood pulpWhiteness: 96-98% whitenessGrammage: 55gsm, 60gsm, 70gsm,80gsm, ... 160gsmSize: in roll or sheetPacking: as grade AGrade C:Material: 30% wood pulpWhiteness: 92-94% whitenessGrammage: 55gsm, 60gsm, 70gsm, 80gsm, ...